You need some sort of (super basic) landing page or just an easily-sharable image that shows your point of contact and your offer. Then it may only be a matter

You need some sort of (super basic) landing page or just an easily-sharable image that shows your point of contact and your offer. Then it may only be a matter of getting that distributed to a handful of people who can take care of this being redirected to the right people. Twitter is an easy place to approach and find someone. Have a look at Facebook Groups to see if it's appropriate to post an image there. If it's a genuine and worthwhile offer, then devs (and people in general) from the Ukraine (there or currently elsewhere) will be happy to pass the message onwards. Especially if it's easy to share (like an image on WhatsApp or Signal). Hope that helps!