Unable to change scrollbar color of Ionic select option dropdown scrollbar

Hi Team,

We created an iOS application in an ionic framework 6 with Angular 11 and Swift 5. I am facing challenges in getting the scroll bar for the ionic select option dropdown scrollbar. I can scroll using touch and view all the contents. But the scrollbar is not visible. I have tried multiple options to set the Webkit Scrollbar Thumb, and Scrollbar properties like Background, Visibility, display, width, etc. but it is not reflecting.

Could anyone suggest us a solution or Provide information to resolve this issue?