Pydantic: Define an attribute of type List with nested lists and multiple sub-models

Question

I have to deal with such a schema:

{
    "method": "Data.get",
    "params": [
        [
            {  # name this "Fetch"
                "select_": "DowntimeMan",
                "filter_string": "cluster='A' AND nodename%('s2')",
            },
            {  # name this "Output"
                "fields": [
                    "DowntimeMan",
                    "rowquality"
                ],
            }
        ],
        {  # Name this "Repeat"
            "repeat_timefilter": [
                {  # Name this "Time"
                    "time_start": "20220503.1600",
                    "time_end": "420m",
             
                }
            ],
        }
    ],
    "context": {
        "nwid": "abc"
    }
}

I wish to create a pydantic model, so my effort is:

from typing import List, Optional

from pydantic import BaseModel

class Payload(BaseModel):
    method: str = "Data.get"
    params: list[list[Fetch, Output], Repeat]
    context: Context

class Fetch(BaseModel):
    select_: str
    filter_string: str

class Output(BaseModel):
    fields: List

class Repeat(BaseModel):
    repeat_timefilter: List[Time]

class Context(BaseModel):
    nwid: str 

class Time(BaseModel):
    time_start: str
    time_end: str

So In the code i would like to set values like

_payload = Payload(params=[[FetchPM(select_counters="DowntimeMan", 
                                    filter_string="cluster='A' AND nodename%('s2')"
                                   ),
                            Output(fields=['DowntimeMan', 'rowquality'])
                            ],
                           Repeat(repeat_timefilter=[Time(time_start="20220503.1600", 
                                                          time_end="420m")]
                            ], context=Context()
                  )

But i get:

  File "pydantic\main.py", line 331, in pydantic.main.BaseModel.__init__
pydantic.error_wrappers.ValidationError: 2 validation errors for Payload
params -> 0 -> 1 -> select_
  field required (type=value_error.missing)
params -> 0 -> 1 -> filter_string
  field required (type=value_error.missing)

So the question is: Can i define multiple Models that are part of a list somehow in pydantic and expect validation?

Note that i would not like to use Union since it implies or relationship. Here my response is always going to look like this: A list of list with Fetch and Output and Repeat