How do I include a helper (counter) in a Notification message

Configuration Frontend
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1

This is what I’m shooting for, the counter is already made. I just need to know how to configure this message:

Wet clothes have been in the washing machine for {Wet Clothes Counter} minutes

2 
message: |
  Wet clothes have been in the washing machine for {{ states('counter.wet_clothes_example') }} minutes
3

Thank you!