How to setup GET API tool inbound customer.number without country code +1 ?

I have CRM (HouseCall Pro) accept short numbers only.
Have say in advance GET https://api.housecallpro.com/customers?q={{customer.number.substring(2)}}
or GET https://api.housecallpro.com/customers?q={{customer.number|remove_first:"+1"}} is not works. Any idea? Based project for United States only maybe is any option to setup global settings ignore country code?
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