Starting with automationbridge version 0.415 (and 0.423 for Alexa), if you are using the Broadlink Plugin, you can now define the created remotes/devices as native blinds.
Step 1 - Make sure that your defined virtual remote is defined with at least OPEN & CLOSE or UP & DOWN buttons as per this example.
Step 2 - Make sure that you have enabled this device from the home page of the automationbridge, and that it now shows in the Google Assistant and/or Alexa tab. You will see that it has a config icon beside the device type label. Click this icon to change the type to Blinds.
Step 3 - Change the drop down to Blind, and then Update to save.
You will now find that the device type shows as Blind on the Google Assistant and/or Alexa page.
When you now check your Google Home app, you will find that the device has changed from a Switch.
To a Blind, and you can now use the native commands of Open & Close.
The same configuration can also be enabled for Broadlink Activities, however please note these must show as vd_broadlink in the Device type column, if they just show as vd, then you will need to delete and re-create the Activity within the Broadlink plugin settings page.
When used with Alexa, you will need to go to the Alexa.amazon.com web portal, forget the device and then re-discover to have it picked up as a Blind.