Is your feature request related to a problem? Please describe.
In a root validator, values need to be accessed with ["field"] and thus, PyCharm does not know the type of the fields.

Describe the solution you'd like
I'd like the plugin to provide the types (which are declared in the model) to PyCharm, like in this example:

import pydantic
from datetime import datetime

class M(pydantic.BaseModel):
    d: datetime

    @pydantic.root_validator
    def _(cls, values):
        d = values["d"]
        return values

Put the cursor on d in the validator and call View -> Type Info. It should display datetime.