Looking for a board-to-board SMD connector found in Google Pixel XL phone
How about a Plateau connector from Panasonic?

https://www.yoycart.com/Product/45271541068/



From this family.

Smallest Mezzanine connectors commercially that I found were 0.4mm and 0.35mm so Google may have negotiated a custom part from Hirose , Panasonic or a number of other reputable OEM's.

If you only need 1 , go look for a phone repair shop or wait 5 years for it to be commercially avail.