Is it possible to map a pydantic __root__ field to a FastAPI query parameter?

Question

My main goal is to define validation rules for name tags only once and reuse it later in diffrent places (e.g. query params, resource path). For that, i try to use pydantic model with __root__ as fastapi query/path parameter.

This and this looks like answer but unfortunately for some reason non primitives fields in query model treats as body fields

The base code:

from typing import Annotated
from fastapi import FastAPI, Query
from pydantic import BaseModel, Field


app = FastAPI()


class TagName(BaseModel):
    __root__: str = Field(example='aot', max_length=128, min_length=3)

Then i try to use the following ways to tell fastapi treat TagName as query param:

Using Query

@app.patch('/')
async def change_tag_by_name(
    query: Annotated[TagName, Query()],
):
    ...

AssertionError: Param: query can only be a request body, using Body()`

Using Depends with simple class

class ChangeTagByNameQuery:
    def __init__(self, tag: TagName):
        self.tag = tag

@app.patch('/')
async def change_tag_by_name(
    query: Annotated[TagName, Depends(ChangeTagByNameQuery)],
):
    ...

It successfully runs, but fastapi just includes ChangeTagByNameQuery.name into the body schema:

...
"paths":{
    "/":{
      "patch":{
        "summary":"Change Tag By Name",
        "operationId":"change_tag_by_name__patch",
        "requestBody":{
          "content":{
            "application/json":{
              "schema":{
                "$ref":"#/components/schemas/TagName"
              }
            }
          },
          "required":true
        },
...

The main