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
Add another SSD to Lenovo Legion 5 : r/Lenovo
How to upgrade or add an SSD to Lenovo's Legion 5i 15 | Windows Central
Lenovo Legion Pro 5i 16 - 13500HX · 4060 · 16.0", WQXGA (2560 x 1600), 165 Hz, IPS · 512GB SSD · 16GB DDR5 · Windows 11 Home | LaptopMedia.com
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