Fannie Mae Form 1007 to help DTI

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How do I go about completing a Fannie Mae From 1007, which is a Single-Family Comparable Rent Schedule, for my primary residence?

I am looking at a second residence, but to make my front-end DTI a little more approachable, I would like to be able to add rental income from the primary residence.

Currently have ~$120k for down and a front-end DTI of ~33%. How unappproachable am I for a conventional loan with 20% down? How can I complete Fannie Mae Form 1007 to try to add the rental income?