Checkbox styling gets lost with tables after rendering

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I have a working template, where I add a (so far not bound) CHECKBOX into one column:

When I render the template, I get this:

So the checkbox LOOK gets lost!

Also, would be great to know how to set/bind the object in the template {{ item.Active }}...and keep the checkbox look.

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Clarification: I'm referring to Excel’s new “in-cell checkbox” feature!

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So far, the only viable option I see is a dropdown option with TRUE|FALSE.