Support for Capacity Reservations

With Azure having constant resource constraints in certain regions, we'd like to use Capacity Reservations (paired with Reserved Instances). We can manually run powershell scripts to add persistent VM's to Reservation groups, but this is a bit tedious to maintain. Additionally if auto-scale is enabled there is no built-in way to programmatically add VM's to the group as they are deployed. I'm not sure if an Azure runbook called as a post-deployment task could be used in the interim, but it would be nice if it was added as a pool-level config when VM's are deployed to add to a capacity reservation group.