Yet another approach is to advance this into a hypotheses backlog as the backbone of the product discovery process. That will, however, require much more effort that keeping a second list or board.
Adding something to bug tracking sounds like Jira to me. As the saying goes:
“When you put problem in a computer, box hide answer. Problem must be visible!”
(Hideshi Yokoi, former president of the Toyota Production System Support Center in Erlanger, Kentucky, USA)