Create a custom property for Users.
Assign appropriate values for Custom Property(Say Name of Stream)
Assign Custom property value to users whom you want to give access to this stream.
Create associated Security Rule for access that stream and Use Custom Property over there while creating a security rule
((user.@SalesStream="SaleStream" and user.@SalesGroup="SalesGroup" and resource.objectType="sheet" and user.@SalesApp="Sales App" and resource.objectType="app" ))
Not sure about object type=sheet
I believe Salesgroup is not required as well cus then it would inividual users with new custom property which we already defined by assigning SalesApp to user as property.
But you'd need to create Custom Property for the
Then add that custom property to the users who would be assigned as a group.
Resource filters should be Stream, App and sheet I guess.
Cannot guarantee if above would work but it is the simplest way I believe.