How to escape "@" and "(" character in password inside PowerShell script

Question

How can I retrieve the "@" and "(" inside of the PowerShell script.

When I'm trying to npm config get proxy the proxy displayed is http://username:ZA%40(testpassword@domain:8080/ but I want to display is http://username:ZA@(testpassword@domain:8080/

TEST: git config --global http.proxy http://username:ZA%40%28testpassword@domain:8080 --replace-all

I am trying to display the "@" by using %40 and for "(" is %28.

I'm thinking if the reserved character "@" is in the side of "("

Please help me out of this problem.