IGToolsPP is a plugin to import SpeedTree models in UE5 as vertex animated nanite static meshes (Pivot Painter 2).
Available at https://artstn.co/m/RpPpN and at https://www.unrealengine.com/marketplace/en-US/product/igtoolspp-speedtree-to-pivot-painter-2
Docs https://inu-games.com/igtoolspp-documentation/