I think you can but depends on the version of vrops. in 8.6 (not sure what version it was introduced) you can create custom rest payloads and do about 90% of what the webhook can do natively in vrops now.
as an example you can add custom properties (up to you how you add the either API or with group membership) to the payload. In this case i have "is linux" dragged across
on the next page you can coup it from the parameters section and add it to the payload
I have not tested or use this function because the 10% that this does not do that the web hook does i need. Hope this will point you in a direction