Yes, Legion 5 Pro has two NVMe PCIe 3.0 2280 SSD slots, the second slot is empty and has a pre-installed heatsink with a thermal pad. (I installed Samsung 970 Evo 1TB
The Lenovo Legion Y90 to employ an SSD and UFS 3.1 storage in RAID 0 - GSMArena.com news
Lenovo LEGION 256GB Mobile SSD NVMe Solid State Drive for Y7000 / Y7000P / Y9000K