Only if you're making a raisin wine. I've used as much as 4 lbs in 6 gallon batches of apfelwein & graff, couldn't taste the raisins. I've used raisins in cyser, blackberry wine, blueberry & plum wines, couldn't taste them at all in any of them.
Raisins WILL add a bit of sugar & a bit of body to a wine. There are many recipes out there that use a couple lbs of raisins. For the OP, I'd pulse those raisins in a food processor to roughly chop them & contain them in a mesh sack when adding them to the wine. Easy peasy.
Regards, GF.