How do I set an option for a subproject of a subproject in meson?

Question

Inside my meson.build, I have the following dependency:

gst_dep  = dependency(
    'gstreamer-1.0'
  , version: '>= 1.22'
  , default_options: [
        'tests=disabled'
      , 'examples=disabled'
      , 'gst-examples=disabled'
      , 'introspection=enabled'
      ]
  )

I also have a .wrap file for GStreamer inside the subprojects folder. The above works well. However, I need to instruct a subproject of GStreamer that I don't need OpenH264. I tried this:

gst_dep  = dependency(
    'gstreamer-1.0'
  , version: '>= 1.22'
  , default_options: [
        'tests=disabled'
      , 'gst-plugins-bad:openh264=disabled'
      , 'examples=disabled'
      , 'gst-examples=disabled'
      , 'introspection=enabled'
      ]
  )

Meson complains:

ERROR: In subproject gstreamer: Unknown options: "gstreamer:openh264"

Is there a cure?