Well i know for a fact natural sugars such as molasses and honey are very beneficial for plant growth. It would be an interesting experiment. Make sure you have the right ph and and natural sugar and i bet it would do something....
i remember someone saying the ph is WAY off or something like that. other than that i dont really see any reason to. the plant wont taste like tea and the sugar wont be benificial either.
if your want something sweet to feed your plant..why not just feed it a little molasses..
if your just wantin to see if you can get a tea taste..
just put some tea bags in your water but not the sugar and just see what happens.....