look for proxies after unfolding

Hello greetings to all, I wanted to get information since I am breaking into ionic PWA and the issue is that after running the mpn run build; the folder that generates I need to find the proxies that I made in the ionic.config.json; I need to know where I find those proxies that I already made in the www folder that it generates when making the npm run build.

All help would be of great importance beforehand thanks