This is possible now with the addition of Super Neighbors. You can add a super neighbor by clicking on their picture in the neighbor bar and selecting Set as Super Neighbor. You can also give them permission to plant crops or design your farm for you.
For full details on how to make a neighbour a Super Neighbour and what exactly it is you can give them permission to do please click on this link:
Super Neighbours
We do recommend you use this cautiously as they will be able to harvest and plant for you without any input from you. The amount of crops you get is the same you would get if you were to hire a neighbor normally. The amount they get from working as your super neighbor is the same as what they would normally get if you were hiring them in the normal way too.