Add option: Representing dependencies of structures within the same package in a UML class diagram

[GenkiHirano]

I want to express the dependencies of structures within the same package in a URL diagram.
I would be happy if you implement it.

package model

type Address struct {
	postalCode      postalCode
	prefecture      string    
	city            string   
	streetAndNumber string
	buildingAndRoom string
}

type postalCode struct {
	string
}