Here’s a topic I wrote on integrating Rollerhouse shades with the Qubino shutter module.
There’s a link to the device handler I wrote for that device about half way down the page and it allows you to use the device as a dimmer in Alexa and Google Home.
Alexa / Google Home commands:
Turn on - opens shade all the way
Turn off - closes shade
Set to <#>% - Sets the shade to the specified # with 100% being completely open and 0% being closed.