Sorry for the size of the image, was trying not to let the perfect be the enemy of the good
I recommend that you use the https://workbench.developerforce.com/ to become familiar with query formats and object structures in your organization.
In this example I mention two things, using XML (which generated errors) and submitting the query string as an object (also never succeeded) I mitigated both by using native json headers, and appending the query myself. There is no other supporting documentation for the card that I could find, so if someone knows how to get it working with the query object, I am open to the feedback.
I hope this saves someone else the time that it cost me…