Can VMTK directly import STK file?

Hi all, I’m trying to carry out an artery annotation task, to segment and annotate each artery name of an artery tree and hope to use the ‘vmtkbranchextractor’ command.
However, my data all came in STL format, I’m wondering if VMTK can support the direct import of STL files? If not, since the VMTK extension for 3D-slicer doesn’t support brachextractor, is there any other way to proceed?