Customers have the ability to get nodes and view labels as the customer-admin. This will provide a way to target any VM in the scale set.
Caution must be used when using specific labels:
Hostname must not be used. Hostname gets rotated often with upgrades and updates and is guaranteed to change.
If the customer has a request for specific labels or a deployment strategy, this could be accomplished. However, it would require engineering efforts, and it isn't supported today.
For more information, see Controlling pod placement.