@NilsonLima
Personally I wouldn’t mind that, but I’d suggest asking Epic first, if it’s not against some Marketplace rules.
It’s also worth noting that of course they’d be trees without any dynamic features, since you can’t include other Marketplace systems in your Marketplace product. You could probably convert the trees to static meshes via File -> Export Selected… I don’t know if the Merge Actors tool is finally fixed or not - but it had many problems converting these trees to static meshes.