I wonder if this Drafts integration would work as a workaround for now:
Create a note in Agenda in a project named “Inbox”, using the first line as that name of the note and remaining text as the note content. A project named “Inbox” must already exist. To target other projects, this example can be editing changing the “project-title” parameter in the Callback URL step.
For more details on options available in Agenda, visit their URL scheme documentation.