jellyfin-media-player/resources/inputmaps/apple-media-keys.json

{
  "name": "Apple Media Keys",
  "idmatcher": "AppleMediaKeys.*",
  "mapping":
  {
    "KEY_PLAY": "play_pause",
    "KEY_NEXT": "step_forward",
    "KEY_PREV": "step_backward",
    "KEY_FAST": "step_forward",
    "KEY_REWIND": "step_backward"
  }
}