Geometry nodes shape keys with export support

As the title suggest. To be able to create shape keys for a mesh and have it able to apply as a shape key.

Thought of the idea with the release of the Bake node. As I export a lot of geometry to Unity and enjoy the modelling procedure in GeoNodes. And when you realise the geometry and apply it it saves it to the data properties.

An alternative thought could be to have the ability to save it in the modifier panel. Where it saves the shape to the base geometry data properties.