Actually, Mikrotik is presently not supported on the ath79 target (just the deprecated ar71xx target) and I haven't seen any success in porting it over. It will be interesting to see how the project handles this as ar71xx is slated to be removed from builds.
Knowing that a brand is supported means little for the next model. Even within the same model number, there are changes in chips, or even complete design, that even occasionally aren't represented by any outward marking, like a version number. Not at all safe to make that assumption.
Possible today? If not listed on the supported hardware page, no.