Would it be possible to export skeletal with flex animation to source filmmaker?

I’ve created a couple of custom characters for use within Source Film Maker, I can animate them in it and I got custom shape keys/flexes to work.

But I find myself taking twice as long to animate in it than rather doing it in other software due to the ability to use more complex rigs.

I know how to export just the skeletal animation.

Would it be possible to animate in Blender with shape keys in it as well, and export it into Source Film Maker as a sequence with shape keys/flexes?