That is AWESOME! Congrats!
Yes that’s right, portainer stacks equate to compose… I might be wrong, but I remember reading somewhere a while back that they (and other container orchestration tools) were not permitted to reference “Docker” or its products (including compose) due to legal and licensing restrictions by Docker.
Not to the level of Reddit, but Docker has its fair share of questionable business decisions.
As a sync user I support this and would like to see it lol