Make mob move towards certain block?

If you know how to code, this should help. Otherwise, I am not sure, but don't think it is possible in MCreator;

am making an ant hill, and want the ants to move towards a nearby ant hill block

There are two stages to this. However, they can all be consolidated to one EntityAI class.

First, we have to find the block, we can do so using;

BlockPos::getAllInBoxMutable

Iterate through the results and if one matches your block (or vanilla block as you stated) do;

PathNavigator::tryMoveToXYZ