Why I cannot control the slat angle of my external venetian blind?

I purchased this product to test before rolling it out to all my clients who require Matter compatibility.
The online documentation says: "Suitable for venetian shutter switch: YES"
But during my tests, I can just control the position, not the slat angle.

I'm disappointed, I really want to use this production on all my projects.
I'm currently using the solution from BOSCH and it works great! But the hub is annoying to install and I want to have something directly compatible with Apple Homme app.

Is there any chance they can update the firmware and add this feature?

Thank you in advance for your help.