Dataloaders in a subscription payload

[Zagrebelin]

I have a set of dataloaders described here https://docs.graphene-python.org/en/latest/execution/dataloader/.
When I subscribe to objectType without dataloaders fields, everything works fine.
When I subscribe to objectType with dataloaders field, I got an TypeError: Object of type Promise is not JSON serializable
here

How can i solve this issue?

[millar]

I have an open PR to address this: #26