[Feature Request] The @@validate attribute could allow relations to be used (as @@allow does)

[ludovicmotte]

Is your feature request related to a problem? Please describe.
I wish I could use relations within the @@Validate attribute to implement complex validations.

Describe the solution you'd like
Let use this model: https://zenstack.dev/docs/the-complete-guide/part1/access-policy/relations#-to-one-relations
And let's imagine a List has a state like "pending" or "open"
I would like to be able to write something like this in the Todo model: @@Validate(list.state!="pending", "You can't have a Todo for a pending list")

Describe alternatives you've considered
On discord https://discord.com/channels/1035538056146595961/1224729455696810129
jiasheng suggested me to write
@@deny('create, update', list.state!="pending")
But it seems like a workaround because i implement a data validation with an access policy
And I no longer have my custom error message.