Conidtional Formating Visuals

Hello, 

I'm currently working on a custom theme for my Power BI Template and everything works perfectly (with the exclusion of text fields and the new filter pane). But I'm looking for a visual that can use conditional formatting AND work with custom themes. I want to display a percentage, preferably in a gauge format. 

In the regular template i'm using the PayPal KPI Donut Chart, which does the trick, but I cant seem to get it to work with custom themes. 

Any ideas? I already found work around for a lot of other missing stuff, such as basic shapes and lines (as you can only format 1 basic shape if i'm correct), even images. But not custom visuals.