I tried it using the Quote option:
https://busy.org/@preparedwombat/6e9a8ee8-8260-4cfe-b185-8363006b5913u02x93

The interface is a bit buggy. Where I entered the text, words were chopped off (font leading was too tight). Also, the tag that I entered does not display from either Steemit or Busy, only the #steemblr tag shows up.

I’ve never used tumblr so don’t know how closely it mimics that service.