setting a value based on a condition on environment variable as a number in github action

I am trying to set a value based on a condition whether an environment variable is bigger than x.

Something like:

steps:
  ... setting env.COVERAGE
  - name: create badge
    with:
      ... 
      color: ${{ env.COVERAGE > 90 && 'green' || 'red' }}

I understand how to set a value on condition (${{ condition && ifTrue || ifFalse }}) but did not manage to use the value as a number.

How can I do that?