Ants and weeding

Can you hire ants to do do the weeding for you ? Like spraying water with sugar over your weeds to incite ants to eat them

I don't know, but I think that is something worth trying. Perhaps, little sugar cubes inserted down into the roots would encourage the ants to munch on the roots which could be more effective at handling the weeds.

Another option that I might look into is changing the way you mow your lawn. If you increase the height of your mower, the grass might be better able to out compete the weeds. It may even be possible to grow neat stuff in your lawn and make your yard a mowable meadow of good-smelling stuff.

Outside of the leafcutter ant, I don't know of any ants that eat or harvest leaves. So that's something you would need to research.

Most species do not harvest plant material for food, the exception is the leaf cutter which uses the plant material to grow fungus that is their only  food source.

Feeding ant colonies sugar will only insure that you have a larger colony of ants, the leaf cutters will not go for sugars since they only eat the fungus species that they grow in their colony.