Mocking db connections and return values inside a flask route

I have the following flask app route:

# routes.pyfrom flask import jsonifyfrom app.utils.db import db_connection, db_query@api.route("/some/route", methods=["GET"])@authdef get_data_for_some_route(**kwargs) -> List[Dict]:    # connect to db    db_client = db_connection()    # Query db for data    data = db.query(db_client, GET_STUFF)    # parse the data example    parsed_data = data[0]    return jsonify(parsed_data), 200

How can I write a pytest for this route, but mock the db connection and query results?

# test_routes.pyimport pytestfrom fixtures import SOME_ROUTE_JSON_DATAmock_token = "12345"def test_get_data_for_some_route(mocker, client):    querystring1 = 'Hello'    querystring2 = 'World'    # Mock db query function    mocked_db_query = mocker.patch('app.utils.database.db_connection')    mocked_db_query.return_value = loads(SOME_ROUTE_JSON_DATA)    # Call the route    response = client.get(        f"/some_route",        headers={"Authorization": f"{mock_token}"}    )    # assert response.json is some value I expect it to be

I'm a little confused how to mock values within the route. So the database connection can be ignored and I can also say 'this is what the return data will be in this case, continue on testing the function pretending that is what the data is.'