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
Lenovo Legion 5 Pro 16ACH6H Right SSD Replacement - iFixit Repair Guide
Disassembly and upgrade SSD HDD on LENOVO LEGION Y530 m.2, replace, repair, guide, DIY - YouTube
Lenovo Gaming Desktop Legion T7 34IRZ8 90V7004LUS Intel Core i9 13th Gen 13900KF (3.00GHz) 32GB DDR5 1 TB PCIe SSD NVIDIA GeForce RTX 4080 Windows 11 Home 64-bit - Newegg.com