A good first step would be for an official from the Defold Foundation to fill out the application form on the page https://www.unrealengine.com/en-US/megagrants
Possibly they would be interested in long term support. I don’t have any good contacts for Epic myself right now. You could try reaching out to Tim Sweeney directly but I would still fill out the form first. The people who review the applications will eventually approve or reject.