I use Scrivener a lot and miss having access to my Scratchpad when away from my desktop. So, I created two Shortcuts so I can add notes when I’m on my iPhone or iPad. Maybe they are useful to you, too. One saves them in the package rtfd format, the other one saves in a plain text file. You can type or dictate your note.
They need a little work. For example, you can only get multiline input if you paste in the text of your note. The dictation doesn’t last too long, either. Despite those limitations, these have been helpful to have. Often when I’m processing and have notes I want to add to Scrivener, I can pull up the Shortcut and get what I need.