[Core][Diffusion] Add a typed pre-D2H video media contract (#6615)

Signed-off-by: NancyFyong <NancyFyong@users.noreply.github.com>
Signed-off-by: Samit <285365963@qq.com>
Co-authored-by: NancyFyong <NancyFyong@users.noreply.github.com>
Co-authored-by: Samit <285365963@qq.com>

docs/mkdocs/hooks/generate_argparse.py

@@ -2,6 +2,7 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
 
 import ast
+import json
 import logging
 import re
 import sys
@@ -124,6 +125,7 @@ def extract_omni_serve_subparser_init():
                         "make_arg_parser": lambda parser: parser,  # no-op for doc
                         "_ensure_vllm_platform": lambda: None,  # no-op for doc
                         "_nonneg_finite_float": float,
+                        "_json_object": json.loads,
                         "_parse_stage_overrides": __import__("json").loads,
                         "VLLM_SUBCMD_PARSER_EPILOG": "",
                         "logger": logger,