create a chromium best web browser : with user agent default style sheet changeable

I am looking for a freelancer to create a chromium-based web browser compatible with Windows. The ideal candidate should have experience in web browser development and be able to implement the following features: I want all features that default available in Google Chrome official browser. Additionally, I want one file in this browser's installation path, that is called "[login to view URL]" or "[login to view URL]" or something like this, so that through this file I am able to change the Chrome browser default styles CSS for my all  Chrome profiles together. As this feature was already in the old version of Chrome I want it in the new version also. Nowadays it is possible through any "styles Chrome extension" but I don't want to use Chrome extension, I want this feature in default Chrome installation setting so it may be applied for all created new profiles in Chrome in the future automatically. Some Resources: [login to view URL] [login to view URL] https://chromium.googlesource.com/chromium/src/+/main/docs/windows_build_instructions.md#Install The ideal freelancer should have experience in web browser development, specifically with chromium-based browsers. They should also be familiar with Visual Studio C++ etc.