Currently, the popup option cannot be set through data attributes(data-popup). I have logged this as a bug in the Kendo UI GitHub repository
from where you can start tracking the issue. I am also happy to let you know that I have committed a fix for this bug. After the change undergoes extensive testing, and if everything is working correctly, the fix will be included with the next official release in mid to late May.
As a temporary workaround you could use the following script:
Refer to the following Dojo example
where the above patch is included.
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