**Description**
In the trigger page, there is a text area to enter (optional) conf json. It would be great if a sample JSON can be provided programatically while defining DAG

**Use case / motivation**

This will improve usability of the UI that triggers a DAG

tests/www/test_views.py
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#
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import copy
import html
import io
import json
import logging.config
import os
import re
import shutil
import sys
import tempfile
import unittest
import urllib
from contextlib import contextmanager
from datetime import datetime as dt, timedelta
from typing import Any, Dict, Generator, List, NamedTuple
from unittest import mock
from unittest.mock import PropertyMock
from urllib.parse import quote_plus
import jinja2
import pytest
from flask import Markup, session as flask_session, template_rendered, url_for
from parameterized import parameterized