Hello @josephstpaul ...
Nope...the Canvas Inbox does not have the Rich Content Editor (RCE) to use when composing messages to your students. This is a pretty popular request for Feature Ideas, though. You can find more information on it by checking out Add rich-content editor to Conversations. You can add your comments to this Feature Idea and also rate it if you want. See How do idea conversations work in the Canvas Community? for more information.
I know this isn't the answer you were probably hoping for, but I do hope it has helped to answer your question. Let Community members know if you have any other questions about this...thanks! Take care, stay safe, and be well.
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