I have a similar requirement ,My requirement is that I must be able to mount a remote mount in awx, the way we are running awx is standalone docker images
This what I did to make things work in normal environment
So when awx is installed in a normal estate all it does is within the {{awx git repo clone}}/installer/roles/local_docker/templates/docker-compose.yml.j2
and from that it creates /root/.awx/awxcompose/docker-compose.yml
All I had to do was edit /root/.awx/awxcompose/docker-compose.yml to mount the volume ( this is the same place where you can use custom images as well)
The only bad side of such a setup is everyime I upgrade my awx instance I will need to manually change the file to add the remote mount.