Pydantic union discriminator based on filed on parent model

i have model like this:

class Foo(BaseModel):    protocol: str    protocol_params: Union[ProtoclOneParam, ProtocolTwoParam]

ProtoclOneParam and ProtocolTwoParam have no same field with distinguishable value so I can use them as Discriminator and the only way that I can understand which model should be used for protocol_params is through the value of protocol which can either be "protocol1" or "protocol2".

if protocol == "protocol1" then protocol_params should be deserialized using the ProtoclOneParam model and so on.

in actual use cases, there are more than 5 protocols without any distinguishable field among them.

is there any way in pedantic to achieve what I need?