Link for re-roll in a roll template

I've got a roll template up and working but would like to add a link in the output for a player to re-roll the attempt. More specifically, it needs to re-roll all the dice (d6) that were not 6s and then count the new number of 6s (successes) and add the number of successes from the first roll. E.g. First attempt comes up 6,6,5,2,1 = 2 successes. Re-roll rolls 3d6 and gets 6,2,1. Result of re-roll = 3 successes (2+1). How would I go about this in the sheet's html?

There's no way to do this without an API script. You cant do it in html.

Ah right, thanks!

MIGHT be able to do this with some fancy roll template code, but I can't guarantee it and it'd be a massive amount of code if it is possible. Might be better to simply make a reroll sheet roll that goes something like [[?{reroll how many|}d6+?{previous successes}]]

How would you store the previous roll and know how many dice you'd need to roll on the reroll?