Support for Velux Active "Silent operation" switch

I am using the HomeKit integration for controlling my Velux covers, which works well.
In the Velux app, there is a switch for a “Silent operation” mode, which makes the covers move more slowly and quietly, and it would be useful if I could change it dynamically before opening/closing through HA.
Does anybody know if this option is even exposed to HomeKit and available for integration?
I could try some testing and modifications myself, but I don’t even know where to begin, so I’d appreciate some help or directions.
Thanks!