Is it possible to use an external editor to edit notes in iOS?

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I use Windows 10 and iOS. On desktop, I’m interested in using Mark Text as an external editor because of the partial WYSIWYG view (if I can get it to work with the Joplin desktop app).

This is probably a long shot, but are there any markdown editors on iOS that can be used as an external editor alongside the Joplin iOS app? Is this even possible?

Thanks for any help