I’ve just done this and think it is a really excellent initiative. Obviously there are lots of ways to help but assisting businesses to try and remain afloat has to be a good thing to do for the longer term future of Ukraine.
Apparently you can although that’s not set up yet. You have to donate and then wait until the catalogue is ready.
I went for random on the grounds that it’s more about supporting them (esp. the young team who have set it up) than needing or wanting anything in particular. If something is wildly unsuitable I will just whack it in the Present Cupboard.