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Especially enticing as the PNG file format does allow for additional compression/filter methods and new ones could be added to a PNG 2.0 standard. A small wishlist discussion about that at the W3C's PNG specification Github.
Also, Chris Taylor published an experimental PNG library with Zstd hardwired in.
That's not necessarily the case with the jpeg2png decoder, but it's been a while since I used it, and I'm not able to test right now. The PNG files will be smaller than with the usual JPEG decoding process, at least.
The number of Google engineers who have contributed to libjxl (including myself) can be seen here: https://github.com/libjxl/libjxl/graphs/contributors
I mean something better than Google's best engineers trying to optimize LZ77's compression as much as humanly possible, while remaining compatible with the DEFLATE/zlib bitstream.