Darn. I had the same question as OP but have been working around it by combining everything into the same stack. It’s just a bit of a pain to edit the stack every time I want to test something or retire a service.

Good work-arounds though! Maybe I should move to a script-based startup… Only trouble is all my containers are tagged with restart: unless-stopped so Docker restarts all of it at once on reboot which would mess up the order. Hmm.