Currently Canvas Apps has Icons as part the design studio but those are not inline with Fluent UI design. It would be great to include Fluent UI Icons as part of Canvas Apps.
It talks about bring our own icon. But this idea talks about making the already available icons compatible with Fluent UI icons. As Microsoft has introduces Fluent UI for Web and Mobile development it would be nice to have Fluent UI icons OOB and no need for them to be added by the users.