Unless fiction provide a mean to measure, no, as the dimension is infinitely expanding, mean they are in the process of expanding, that mean the size of said dimension constantly increaese over time, assume that nothing stop the expanding, so in order to measure the stats of someone who destroy such dimension, we need to know the size of said dimension at the time of its destruction to calculate. So if the verse do not give means or informations for us to measure, the feat is unqualifiable, and we get nothing, because if the information is only: destroying an infinitely expanding dimension, then well, we have nothing to do. It could be even room-sized destruction feat, cause dimension is an umbrella term and not always mean universe, actually it by default we don't assume dimension automatically = universe, and infinitely expanding just mean, something is expanding, infinitely, and even a room-sized dimension can expanding infinitely
So wrap up, if the informations is only this and no more informations, contexts is given
Then it is unqualifiable, we can't do anything about this, at best we can only slap Unknown rating