This looks like a better idea than adding it to =. I must admit my initial proposal was just to emulate dbg! macro with f-string but as per the arguments I think there are broader use cases with f-string syntax where filename and line number could be a noise.
Having it as a separate function seems good where users can explicitly opt in for it instead of print() to use it for debugging. There are pypi packages like icecream [0] that implement this type of utility function and could be a good one to have in core.