So I'm playing Dragon Heist in Waterdeep and we just found the Stone of Golorr (no spoilers). My DM told me to roll on the Artifact table and I ended up getting Disadvantage on all STR and CON ability checks and saving throws. I thought it would be easy to make a homebrew feat as I dont recall any other way to manually enter it in to my digital character because I can only add proficiency, override numbers, and expertise. 

Now when I created the feat, I entered in Modifier: Disadvantage, Sub-Modifier: Ability Checks, and Ability Score: STR, and copied that for Saving Throws, and then for CON as well. The only problem is now I have a double disadvantage on all "saves" that doesn't apply when I roll digitial dice, and I have disadvantage on ALL ability checks that does apply in my digitial character sheet. 

How can I edit this feat to allow this to fit and work on a digital sheet? New to making homebrew, thanks for any insight.

Modifier: Disadvantage: Subtype: Strength Checks

Modifier: Disadvantage: Subtype: Strength Saving Throws

Modifier: Disadvantage: Subtype: Constitution Checks

Modifier: Disadvantage: Subtype: Constitution Saving Throws