I think that would be a very good thing.
For example, if this happened to someone and, after 10 weeks, they felt ready, they could return to work. In my case, I went back after five weeks, but I wasn't really capable.
So it would help to have hours or weeks banked. Five probably would have been used and then there would be 30 left, which could be used over the years. But there should be no expiry date. For example, it could be decided that the recipient would have one year to use these 35 weeks, as is sometimes the case in the government. Instead, this should be spread out over two or three years. Some trials can take place three years later.
If someone has used all the weeks and the trial comes up, that person will relive the tragedy. When the trial comes up, you relive the day when you learned about the death of your loved one. So there are other steps to take. If the person doesn't have any weeks left, he or she will have to go through the same situation again that happened at the very start. That person will be lost and unable to work.
Being able to bank the weeks for later would be a very good solution.