Set Label and Custom Metadata Via URL Scheme

I frequently use a Drafts action to send text into Devonthink

This action uses the DT3 URL Scheme:

x-devonthink://createText?title=[[title]]&location=''&text=[[body]]

Is it possible to set a label and to set Custom Metadata via URL scheme? I do not see those as options in the DT3 documentation.

No, you cannot set a label nor custom metadata via the URL scheme.