I followed this guide:
Running
jimmy-cli-windows DraftsExport.draftsExport --format drafts
Sorry I'm little bit confused, where I have to append:
--frontmatter joplin
Thanks
Edit:
I used
jimmy-cli-windows DraftsExport.draftsExport --format drafts --frontmatter joplin
And everything worked fine
About note title, it could be intereseting to limit to 80 characters, sanitizing eventually from charachters that can be not compatible with title format.