Since ClickUp provides unique email addresses for lists, it would work nicely with Mail action steps set to send in the background.
To get started:
- Duplicate the default “Mail” action in Drafts (swipe to right on it on iOS, or right-click Mac).
- Edit the copy, change the name to “Send to Clickup List” (or whatever).
- Tap on Steps, then the mail step, put the unique email for your Clickup list (see their docs) in the “To” field.
- Scroll down and enable “Send in Background” (so the Mail window will not pop up).
That should get you a working action that creates a task in the specified list with the first line of the draft as the task name, and remaining text as the notes.
Because it is email-based, I would expect a short delay before the task appears in their user interface to allow for them to receive and process the email.