How to make Container Path available to different container?

HI All, need some help as a noobie. I have a Home Assistant container with a /volume1/docker/homeassistant which is HA's config path (/config).
I have a separate Code Server container that needs RW access to that path.

How do I create a volume inside the Code Server container that maps to the Path inside the HA container? ... without rebuilding either container?

Thank you for the guidance!