There is a better way to do this....
Create a calc like this FLOAT(MIN(1)) and place it directly to the right of the pill you want.
Then right click on that calculated field and make it a Dual Axis, then Synchronize the Axis.
Charge the Mark Types to Bars and Color them as you need.
Then, click on the Top Axis FLOAT(MIN(1)) and choose "Move Marks to Back"
Finally Unshow Header and clean the formatting as needed