Currently the Braze schema for Canvas table includes columns like channel_email, channel_ios_push etc. However i would expect a column for in-app messaging (e.g. channel_inapp_message). This is another channel of communication Braze offers, and their Currents data models, but it seems like your canvas table doesn't capture that for some reason. 

Important to note that FT does capture data coming from in-app-message as you do have an in_app_message_event table available.