Sharing AGFIs with user groups (modify-fpga-image-attribute)

I'd like to share FPGA images with just accounts in my company's AWS organization.

https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/modify-fpga-image-attribute.html suggests appending user-groups to user groups might work, but the aws-fpga FAQ. implies this can only be done a global scope.

Is there any plan support user-defined groups, or should I share with a list of IDs?