Add Support For Gandalf Source

[TosinJs]

Description

Motivation and Context

How Has This Been Tested?

Screen recording (compulsory):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Improvement (general improvements to how code looks/works)

Checklist

• I have created a branch for this patch/feature.
• My pull request addresses exactly one patch/feature.
• Each individual commit in the pull request is meaningful.
• I have tested manually on my deployed review app.
• My code follows the code style of this project.

• I have requested and received approval from a peer
• I have requested and received (initial) approval from the code owner
• I have completed QA testing
• I have received final approval from the code owner