Hey - thanks for your patience, adding Text is finally possible. In beta at the moment, and you can try it out by downloading the beta through Testflight!
(Beta download instructions: https://discourse.shapr3d.com/t/welcome-to-shapr3d-beta/7003)
https://discourse.shapr3d.com/t/beta-5-30-advanced-fillet-new-text-tool-and-more/16287
OR wait until our next release comes out in the App Store