No. Mopidy provides audio data. Snapcast reads audio data. You can link them together via a couple of mechanisms as explained in the snapcast documentation but Mopidy has no idea it is connected to snapcast and there is no specific support in Mopidy for snapcast. Similarly, you can have snapcast take audio data from other programs, such as Shairport-Sync.
Mopidy does not have any mechanism to read audio data from random places. It definitely does not understand Apple’s Airplay protocol. You cannot do this.
Instead, you can send audio from your Apple thing to Shairport-Sync. Shairport-Sync can use your playback device to play that. I guess there is some way to configure Shairport-Sync to use the Bluetooth things you have but that’s an extra detail. Mopidy is not involved anywhere for this.
If you also wanted the separate ability to use Mopidy to play your Local files, Spotify, YouTube etc, instead of playing from Shairport-Sync, you can do that. This would be two entirely separate programs trying to play to your Bluetooth things, potentially at the same time. You should be able to configure an ALSA dmix plugin to allow two programs to use the audio device at the same time (no idea if Bluetooth audio devices are special cases). To avoid a garbled mess, you either need to manually make sure only one program is active at a time, or, you can use Shairport-sync’s
run_this_after_play_ends config settings to tell Mopidy to stop/stop using the playback device. e.g.
run_this_before_play_begins = mpc stop.