Not sure I understand exactly what your end goal is…if it’s just to have link in the text of a draft you can tap to open a new message addressed in Mail, you can just place the email address in a draft, and enable Link Mode and the email address will become a tappable link.
If you are wanting to automate this further, you can create email actions already configured to sent to specific addresses or groups. The email integration guide covers some of these basic of configuring mail actions.