You cannot install a second M.2 SSD with a size of 80 mm in the Lenovo Yoga Slim 7i Aura Edition. The laptop is only equipped with one M.2 SSD slot, and this is specifically sized for a 2242 SSD (22mm wide, 42mm long). There is no additional slot for a second SSD, especially not for an 80mm long SSD.

Thanks, which is a pity. But thin, quiet and two slots for SSD would be a bit too much.
Unfortunately, I'm looking at two SSD M2 and 32GB Ram on a Lenovo.
But also at a favourable price ;-)