That's a tough one, you can add taxonomy to content blocks programatically, similar functionality has been discussed and we have provided a code sample here.
However, What I'd recommend you is to take advantage of our Lists module as it offers you much more flexibility in terms of what you-re trying to achieve - you can add custom fields to lists, create parent-child lists and still use the same functionality as in content block. Please let me know if you need any additional information, and provide me with some additional details if the proposed solution does not suit your use case scenario.
All the best,
the Telerik team
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