code: def register_output_renderer():
      return {
          "extension": "blob",
          "render": render_blob,
          "can_render": lambda: False,
      }
  
imports: from datasette import hookimpl
  from datasette.utils.asgi import Response, BadRequest
  from datasette.utils import to_css_class
  import hashlib
label_desc: Use image node_id 1 for calling a global function with example usage: register_output_renderer() and returns: dict