Stack Column Chart with Data Type

Hi,

I would like to know how to create this type of Chart (with stacking) using a Data Type. It's really easy using records but I'm practicing using ctds and I can't figure out how to create this.

My data type has two parameter, Category and Subcategory, and I want the chart to show for each category, how many subcategories of each are there. Hope the image is more clear than my explanation.

Thanks.

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