Subscription spec miss metadata field

[FarmerChillax]

What content needs to be created or modified? Subscription spec

Describe the solution you'd like See the complete spec

Where should the new material be placed? https://docs.dapr.io/reference/resource-specs/subscription-schema/

The associated pull request from dapr/dapr, dapr/components-contrib, or other Dapr code repos #4970

[FarmerChillax]

/assign