Don’t forget the OP1
I have an ASUS ChromeBook that uses the OP1 ARM CPU. Specific part authorised by Google for CBs for a laptop type format rather than smartphone (but based on a rebadged Rockchip RK3399). Still surprisingly capable after its purchase in 2017.
So hopefully an in-house Google custom design might/will be better than existing ARM designs from QC, Mediatek, Rockchip etc.