Snowmanning in Eagle?
The existing "teardrop" scripts don't work because they only process vias and pads, whereas your BGA "pads" are actually "SMDs", which EAGLE handles differently.

I've been playing with this recently, starting with the teardrop ulp, refactoring and having it draw a single fat short wire instead of the "diamond" shape that it used for teardrops.  It's not quite complete, (the 'undo' feature doesn't work, it doesn't handle non-round SMDs or elongated pads, and the documentation needs updated, but it might be worth a try if you're still interested...

https://drive.google.com/file/d/1I7en3EZz3zS1rtGdqCW5XH1y1pqpcChR/view?usp=sharing