I specifically saved this exchange long ago, it is one of my favorites:

Pregerson: And you're a great lawyer.
Voelker: I appreciate you saying that, Your Honor.
Pregerson: I mean, it says so, right there on your web site.

Judge Pregerson of the Ninth Circuit Court in Prenda appeal

I see your predicament. If you want to stick with “burning”, then maybe “burning with interest” is preferable to “interestingness”, even if it’s an expression you’d usually attach to a person rather than a thing.

“Interestingness” is not the way. Probably better to stay away from noun forms. “Sparks interest” has potential. Can you post the whole quote, @chmarchlewitz.bsky.social?