A handy component that can be used to add outlines to your Unity UI https://youtu.be/BEh2s9NOTiE
This project was built using Unity 2020.3.13f1. The shaders were created with Amplify Shader Editor (ASE v1.8.8 rev 14:) plugin but you don't need it to run the project, edit or use the shaders. ASE will make understanding and editing the shader much easier. http://amplify.pt/unity/amplify-shader-editor
I hope someone appreciates the share :) Have fun!