[MM3-users] Exim: is it possible to host mailman and exim on different hosts? Howto?

as of the documentation, https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/docs/mta.ht... , exim4 (and postfix similarly) need to have access to the mailman filesystem (MM3_HOME=/opt/mailman/var). If exim and MM would be on different hosts (or different docker environments), how would we need to configure that?