How to set APP_ROOT

Hello, we have a Reverse Proxy Mapping in front of the camunda web application that is being served, unfortunatly we cannot set headers, i.e. use X-Forwarded-Prefix.

Currently the only option we have to fix this is to use the full url as $APP_ROOT… however after looking at the code it is not clear how this property should be set. Should it be overwritten in a new Filter or is there a simpler way to do this via a property ?