Is jpeg quality a tag?

[hvdwolf]

If this has been asked before: I'm sorry. I did search the forum.

My camera makes jpeg photos in 95% quality (next to RAW). Gimp recogizes this quality. If I save (export) this 95% quality as 85% (or whatever quality) and open them again in Gimp and do again an "export as" to jpeg, it still recognises the 95% or 85%.
Same when copyng the images to another laptop and opening them there in "another" Gimp and exporting them again.

I can't find this jpeg quality in the exiftool output on the same images.

Is this a metadata tag? And if so: Do I not recognise it from the output?

[StarGeek]

The JPEGQualityEstimate tag is not computed unless it is specifically requested.  See the Extra page for a few more details.

[hvdwolf]

Thanks a lot.
So many options still to discover in exiftool