What's the proper configuration for deploying Web (PWA) to sub folder?

Hello! I’m wanting to deploy my app to the web under a sub folder and can get it working without issues for almost everything by manipulating the base href tag in Index.html (on the compiled/build version) however the images are broken. I am using relative paths everywhere in my app.

I’m sure there are some settings I am missing somewhere to allow for this so it does not break while in development and works in production.