Destinations can be anything supported, but you have to create the action functionality to do it. The action discussed above is processing content, but the “Migrate Journal Items” is specifically configured as per its description.
Yes, but you would have to build an action to take in the content and process them in the correct way.
You could also look in the action directory and across the forum for actions that might suit your specific needs. There have been a number of similar actions for processing individual lines in notes over the last few years.
If you wish to generally process lines in a draft, I might also recommend the TA_processLinesFunctionRetain() function in TADpoLe. It can simplify some of the processing.
Apple notes is a bit special, and if you search the forum, you can find all sorts of information about the limitations of generating Apple Notes from Drafts.
nvAlt is working with files in a folder. Drafts can export to file, but you may need to work around sandboxing.
You could use something like this on a Mac:
On iOS, I would suggest using a call out to Scriptable, or to Shortcuts utilising Toolbox Pro, as both Scriptable and Toolbox Pro support folder bookmarking which can allow you to punch through the sandboxing restrictions.
In summary, you can do all the things you want, but the actions as they stand do not do what you want, you would need to modify them to suit your own purposes.