No. But if you put the TODO tag into a JavaDoc comment, then you could easily use normal JavaDoc references to point to classes, members and methods, which should be enough to have a reference at all.
If you are now saying that you cannot refer to the 27th line of a method with that, right. Just extract the code of the 27th line into a new method and you can. :)
Regarding your second question: I recommend to not litter code with project management related information. Code becomes highly unreadable, if you add task assignments, all fixed bug numbers and other things into the code. That being said, if you really want to, you could easily define yourself a Java annotation type and mark arbitrary pieces of your code with those annotations. They might even have different optional fields for the person, the priority, or whatever else you imagine.