Call a variable inside the nested expression in github actions

Question

I am trying to call the variable like this:

with:

tags: ${{ inputs.push_tag_to_release && 'op/post:'[env.tag] ||  'op/post:${{ env.tag }}' }}

where, env.tag = 0.13 (value)

but both the ways [env.tag] or ${{ env.tag }} are showing as incorrect/not-supported.

I tried like this,

tags: ${{ inputs.push_tag_to_release && 'op/post:'[env.tag] ||  'op/post:${{ env.tag }}' }}

and the format function as well:

tags: ${{ inputs.push_tag_to_release && 'op/post:format({0},env.tag)' ||  'op/post:${{ env.tag }}' }}

but not working in any way.