You don't.

The church needs to declare it as a Housing Allowance, not you.  *IF* they do that, it won't be on the W-2 (except probably for Box 14).

Also be aware that if (1) the actual housing expenses *OR* (2) the Fair Rental Value is LESS than the designated amount, that excess amount is added to wages on Line 7 of Form 1040.

https://www.irs.gov/faqs/interest-dividends-other-types-of-income/ministers-compensation-housing-all...

https://www.irs.gov/publications/p517#en_US_2017_publink100033605