Need to Add page in nsis installer

[SivaThiyagarajan]

Actually i just used electron builder (nsis target) to create a setup file for windows application, but i need to add another one installer page in the setup, so i can get the input (serverIP) from the end user and i can modify the api_url in app.asar file or asar unpacked main.js file. Is there is any another way? I checked the Custom Installer script, but it is little confusing. So Please help me in this. And Thanks in advance.