Language injection in YAML files

I'd like to be able to inject a language into YAML files at this location:

steps:
  my_first_step:
    stage: prepare
    title: "demo"
    image: my_image
    commands:
      - echo "hello" > junk.txt

Specifically for each item under 'commands:' The pattern is steps -> random -> commands -> each list item

Is this possible?