JXL in Lightroom on iPad

Hi,

On my iPad, I see there are options to share and export raw files as jxl (great), I was wondering:

1. Where can I find details on the type of compression? As in, is it lossless, does it maintain 16-bit depth, etc..

2. There is a big difference in size when picking 90% or 100% quality - is there any recommendation on which one to use?

3. Given the size reduction and tiny quality reduction, is anyone converting their raw catalog into jxl?

Thank you!