The Legion Y530 can use any M.2 SSD that is NVMe compatible. While the 2.5" bay can be used with an adapter to handle SATA only M.2 disks, the actual M.2 slot will only detect NVMe SSDs.
The Yoga can use either 2242 (42mm) or 2280 (80mm) NVMe SSDs. 42mm SSDs require an adapter, which the 128GB SSD equipped models already have pre-installed. Optane or larger SSD equipped models may not have this adapter.
Some examples of compatible SSDs for the Legion Y530 include the Samsung 970 Pro/Evo and the Intel 600p/760p series SSDs.
If the installed SSD is a supported device, it will show in the UEFI firmware settings as Hard Disk 1