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?

Bingen?