You should download the Splunk 6.x Dashboard Examples app. It will visually show your options, and also give you the code.
In order to do what you want, you could use Advanced XML, which is deprecated. But I think you are better off using the Simple XML extensions that are covered in the app.
Got the Example app. I don't see any examples where I can add href tokens to a table cell. Simple XML might not be capable.
This may have to be something done with HTML & js. Deprecated Advanced XML is exactly why I'm curious about other solutions.
@subtract, have you looked at Drilldown URL Field Value example in the Splunk 6.x Dashboard Examples App?
Even Dynamic Drilldown example covers several use cases.