Manual transmission conversion to Automatic Transmission

You are getting good advice.

This falls under the category of: time, skill, or money.

Anything is possible with the right combination of the above, but very generally speaking, these sorts of swaps are cost prohibitive on modern vehicles.

Your best bet is to sell or trade for an auto trans. You can swap the bolt.ons over to the new truck. But, most assuredly. a trans swap is not going to happen.