Hi Jason,
You can create a View of your layer within Experience Builder and filter to only the ones that say Yes. So, in the expression box you insert Count() and select which view the data is coming from, if it's default or the data view you created:
Create the Data View here:

Select the Data Views when you connect the widget to data

Insert COUNT() and select whitch data view it's counting from:

Let me know if this helps.
Best