You don’t need a conversion to count the hours.
You’ll need your logbook so an examiner can verify your aeronautical experience.
https://www.ecfr.gov/cgi-bin/retriev...se14.2.61_1129
For a CPL you only need 100hrs in powered aircraft. So you could count as much as 150hrs of glider time.
But depending how much powered flight experience you already have you may not be able to fit everything required in the 100hrs.
Ask if you have any additional questions.
So realistically you’ll probably end up with counting less then the 150hrs gliding.