Need help creating Magic Armor, AC 11+ CHA modifier and CHA +1

Hello, 

My DM created magic silk robes that give the wearer, AC 11+ CHA modifier and CHA +1, but I can't figure out how to input that data in the Homebrew creation. Is it even possible to create armor that uses a different mod instead of DEX? 

You will need a combination of two modifiers.

Modifier: Bonus->Subtype Armor Class->Ability Score Cha->Fixed Value: 1

Morifier: Set->Subtype: AC Max Dex Armored Modifier->Fixed Value: 0

Modifier: Bonus->Subtype: Charisma Score->Fixed Value: 1

I hope that helps.

Rakish Leathers - Magic Items - Homebrew - D&D Beyond
https://www.dndbeyond.com/magic-items/1553317-rakish-leathers