Template parse error with alexa intent data_template

Configuration
1

I wrote my own directv component which works with scripts and automations, now working on alexa intents

I am getting the following parse error on a template using a dictionary:

ERROR:homeassistant.util.yaml:while parsing a flow mapping in configuration.yaml column 30 expected ‘,’ or ‘}’ but got [’] in configuration.yaml column 173

ChangeChannelIntent:
      action:
        service: media_player.play_media
        data_template:
          entity_id: media_player.office_dvr
          media_content_type: channel
          media_content_id: {{ {"fox":"002","nbc":"004","abc":"007","cbs":"062","cw":"050","disney":"290","nick":"300","cnn":"212","fox news":"360","tnt":"245","tbs":"247"}[Channel] }}
      speech:
        type: plaintext
        text: OK

If I hard code the media_content_id to a number it works, just not the dictionary
I am just not a jinja2 guy, but online parser i tried outputs the right number when i specify the Channel variable so I am at a loss.