diff --git a/Crashlytics/Crashlytics/Rollouts/CrashlyticsRemoteConfigManager.swift b/Crashlytics/Crashlytics/Rollouts/CrashlyticsRemoteConfigManager.swift
index 84acd6a4ade5..61a1ba4e1a55 100644
--- a/Crashlytics/Crashlytics/Rollouts/CrashlyticsRemoteConfigManager.swift
+++ b/Crashlytics/Crashlytics/Rollouts/CrashlyticsRemoteConfigManager.swift
@@ -35,6 +35,22 @@ public class CrashlyticsRemoteConfigManager: NSObject {
   @objc public func updateRolloutsState(rolloutsState: RolloutsState) {
     rolloutAssignment = normalizeRolloutAssignment(assignments: Array(rolloutsState.assignments))
   }
+
+  @objc public func getRolloutAssignmentsEncodedJson() -> String {
+    let encodedRolloutAssignments = rolloutAssignment.map { assignment in
+      EncodedRolloutAssignment(assignment: assignment)
+    }
+
+    let encoder = JSONEncoder()
+    encoder.keyEncodingStrategy = .convertToSnakeCase
+    encoder.outputFormatting = .sortedKeys
+    let encodeData = try? encoder.encode(encodedRolloutAssignments)
+    if let data = encodeData, let returnString = String(data: data, encoding: .utf8) {
+      return returnString
+    }
+    debugPrint("Failed to serialize rollouts", encodeData ?? "nil")
+    return ""
+  }
 }
 
 private extension CrashlyticsRemoteConfigManager {
diff --git a/Crashlytics/Crashlytics/Rollouts/EncodedRolloutAssignment.swift b/Crashlytics/Crashlytics/Rollouts/EncodedRolloutAssignment.swift
new file mode 100644
index 000000000000..de1789219dfb
--- /dev/null
+++ b/Crashlytics/Crashlytics/Rollouts/EncodedRolloutAssignment.swift
@@ -0,0 +1,34 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import FirebaseRemoteConfigInterop
+import Foundation
+
+@objc(FIRCLSEncodedRolloutAssignment)
+class EncodedRolloutAssignment: NSObject, Codable {
+  @objc public private(set) var rolloutId: String
+  @objc public private(set) var variantId: String
+  @objc public private(set) var templateVersion: Int64
+  @objc public private(set) var parameterKey: String
+  @objc public private(set) var parameterValue: String
+
+  public init(assignment: RolloutAssignment) {
+    rolloutId = stringToHexConverter(for: assignment.rolloutId)
+    variantId = stringToHexConverter(for: assignment.variantId)
+    templateVersion = assignment.templateVersion
+    parameterKey = stringToHexConverter(for: assignment.parameterKey)
+    parameterValue = stringToHexConverter(for: assignment.parameterValue)
+    super.init()
+  }
+}
diff --git a/Crashlytics/Crashlytics/Rollouts/StringToHexConverter.swift b/Crashlytics/Crashlytics/Rollouts/StringToHexConverter.swift
new file mode 100644
index 000000000000..28b50ad9f371
--- /dev/null
+++ b/Crashlytics/Crashlytics/Rollouts/StringToHexConverter.swift
@@ -0,0 +1,35 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+
+// This is a swift rewrite for the logic in FIRCLSFile for the function FIRCLSFileHexEncodeString()
+public func stringToHexConverter(for string: String) -> String {
+  let hexMap = "0123456789abcdef"
+
+  var processedString = ""
+  let utf8Array = string.utf8.map { UInt8($0) }
+  for c in utf8Array {
+    let index1 = String.Index(
+      utf16Offset: Int(c >> 4),
+      in: hexMap
+    )
+    let index2 = String.Index(
+      utf16Offset: Int(c & 0x0F),
+      in: hexMap
+    )
+    processedString = processedString + String(hexMap[index1]) + String(hexMap[index2])
+  }
+  return processedString
+}
diff --git a/Crashlytics/UnitTestsSwift/CrashlyticsRemoteConfigManagerTests.swift b/Crashlytics/UnitTestsSwift/CrashlyticsRemoteConfigManagerTests.swift
index fe8b31d02042..4f175060ccd5 100644
--- a/Crashlytics/UnitTestsSwift/CrashlyticsRemoteConfigManagerTests.swift
+++ b/Crashlytics/UnitTestsSwift/CrashlyticsRemoteConfigManagerTests.swift
@@ -45,6 +45,18 @@ final class CrashlyticsRemoteConfigManagerTests: XCTestCase {
     return rollouts
   }()
 
+  let singleRollout: RolloutsState = {
+    let assignment1 = RolloutAssignment(
+      rolloutId: "rollout_1",
+      variantId: "control",
+      templateVersion: 1,
+      parameterKey: "my_feature",
+      parameterValue: "这是themis的测试数据，输入中文" // check unicode
+    )
+    let rollouts = RolloutsState(assignmentList: [assignment1])
+    return rollouts
+  }()
+
   let rcInterop = RemoteConfigConfigMock()
 
   func testRemoteConfigManagerProperlyProcessRolloutsState() throws {
@@ -61,4 +73,15 @@ final class CrashlyticsRemoteConfigManagerTests: XCTestCase {
       }
     }
   }
+
+  func testRemoteConfigManagerGenerateEncodedRolloutAssignmentsJson() throws {
+    let expectedString =
+      "[{\"parameter_key\":\"6d795f66656174757265\",\"parameter_value\":\"e8bf99e698af7468656d6973e79a84e6b58be8af95e695b0e68daeefbc8ce8be93e585a5e4b8ade69687\",\"rollout_id\":\"726f6c6c6f75745f31\",\"template_version\":1,\"variant_id\":\"636f6e74726f6c\"}]"
+
+    let rcManager = CrashlyticsRemoteConfigManager(remoteConfig: rcInterop)
+    rcManager.updateRolloutsState(rolloutsState: singleRollout)
+
+    let string = rcManager.getRolloutAssignmentsEncodedJson()
+    XCTAssertEqual(string, expectedString)
+  }
 }