Wash nozzles freeze in

Hello dear Volvo driver! because soon the winter is approaching again and it is supposed to get really cold again, I would like to do something against the freezing of my windscreen wiper nozzles. At high speeds on the highway they freeze again and again, because the alcohol at the nozzle exit through the wind quickly vanishes and thus freezes the remaining water. I read in an older forum entry that someone has installed for his Volvo heated nozzles from a BMW. Only this has not been with a V70 I, apparently, as these can not fit with me. The cut-out in the bonnet is with my round, diameter approx. 10mm. The BMW nozzles E34 are rectangular. Does anyone have the same problem here and possibly a solution? Normally at the place of the nozzles are cut-outs in the engine hood lining, which, I assume, bring the engine heat to the nozzles. Unfortunately, this is not enough with my Volvo apparently. Greetings, Mario