How to use the pyinstrument.renderers.JSONRenderer function in pyinstrument

def test_json_output():
    with Profiler() as profiler:
        long_function_a()
        long_function_b()

    output_data = profiler.output(renderers.JSONRenderer(), root=True)

    output = json.loads(output_data)

    assert output['function'] == 'test_json_output'
    assert len(output['children']) == 2

def test_json(deep_profiler_session):
    JSONRenderer().render(deep_profiler_session)

def get_renderer_class(renderer):
    if renderer == 'text':
        return renderers.ConsoleRenderer
    elif renderer == 'html':
        return renderers.HTMLRenderer
    elif renderer == 'json':
        return renderers.JSONRenderer
    else:
        return object_with_import_path(renderer)