I'm unable to define a custom field with a type of 'link'.
This works:
{"mycompany:motto": {"name": "Project Motto", "type": "text"}}
This doesn't:
{"mycompany:motto": {"name": "Project Motto", "type": "link"}}
According to the docs, it should work.
I can save the config entry, but then it doesnt appear in projects.fields