core/homeassistant/components/channels/services.yaml

seek_forward:
  name: Seek forward
  description: Seek forward by a set number of seconds.
  target:
    entity:
      integration: channels
      domain: media_player

seek_backward:
  name: Seek backward
  description: Seek backward by a set number of seconds.
  target:
    entity:
      integration: channels
      domain: media_player

seek_by:
  name: Seek by
  description: Seek by an inputted number of seconds.
  target:
    entity:
      integration: channels
      domain: media_player
  fields:
    seconds:
      name: Seconds
      description: Number of seconds to seek by. Negative numbers seek backwards.
      required: true
      selector:
        number:
          min: -3600
          max: 3600
          unit_of_measurement: seconds