Symfony 7.2 Use behind reverseproxy with custom location [closed]

I want to publish my symfony 7.2 webapp. I dont use a custom subdomain or domain. I want to use an path domain.com/webapp. Unfortunately I cant configure that proxy. The main page is also loading but all the assets are getting loaded from domain.com/css/… not domain.com/webapp/css/… How can I deal with that?

The assets are not the only problem. I just want a simple solution where I set the basepath at one point.

Thank you!