Thank you for your post! I apologize for the delayed response. Unfortunately it is not possible to to use HTML markup language within Avenza Maps. I will file the feature request, and will let you know if the feature becomes implemented.
Adobe released an update to Illustrator 2021 (v25.3) that includes native support for M1 Devices and Rotate Artboard functionality. Please note these features are not yet supported within MAPublisher at this time. See compatibility notes.