Mixamo

How to import

In blender set the scale to 1 on each axis. Once it's node the model will become enourmous, that's alright.
Export the model in the gltf format and import it in godot.
Once imported, open the glb file in Godot, change the root scale to 0.01, and press Re-import

If imported like this, the generated physical skeleton will not have to be re-scaled