How to import (3D) STL file(s) to define volume boundary mesh?

Hello
I am a newcomer to FreeFem++…
I would like to know if there are existing commands/operators to import directly a 3D STL files that would contain the external boundary of a volume/3D domain ?
If no, what would be the main steps to do this, with GMSH for example ?
Thanks for your collaboration
Regards
Lionel