Amazon owns Ring. “Chime” is the name of a Ring device. Ring gets special features through echo devices which no other brand has at this time, including the ability to play sounds on multiple echoes at once when a ring doorbell is triggered. Amazon/Ring call these “chime notifications.“
You can get a spoken announcement like “someone is at the door“ on multiple echo devices with any sensor as a trigger.
But the sound effects, including a chime, are currently limited to one Echo device. Nothing to do with smartthings, it’s just how Amazon has chosen to do it.
If you have a ring doorbell and you want to get chime sounds on multiple echo devices, you don’t do it through an Alexa routine. Instead, you select the doorbell under devices, and then there will be an option there to select the sound you want to play and which echo devices you want it to play on.
So a virtual device doesn’t solve this problem. It can’t be just any type of doorbell. It has to be a ring doorbell with a Ring account connected to your Alexa account, at least as of this writing.
You might still want to be able to identify a virtual device as a “doorbell“ so you could get a different icon for it, but that’s a different issue. 