I don’t that there is an easy build-in functionality fir such a thing
Perhaps MetaSounds in ue5 can slow down a sound (I don’t know) but I’ve necer seen this in ue4.
Furthermore a slowing down ir slowing up would normally change the pitch of the sound.
And than I’m not sure if you really want to do this. It would be really awkward to change the rhytmn of the sound only because the graphics lack behind.