Soldered RAM cannot be upgraded. Period.

No.

Soldered RAM is permanently attached to the motherboard. You cannot swap chips, add more, or mix capacities. The memory controller and firmware lock in the exact configuration at the factory — same capacity, same timings, same everything. Even if you had the tools to desolder and reball chips (which almost nobody does), the board almost certainly won’t boot with a mismatch.

Buy the RAM configuration you need upfront. There is no upgrade path. This isn’t socketed RAM.