Will Xhorse vvdi key tool plus do a Dodge Ram proximity key 2018 and a jeep grand Cherokee 2022? Both have security gateway.

Yes, it will do. You also need a FCA 12+8 gateway bypass cable for 2018+ Chrysler vehicles.

Xhorse key tool plus supports the following Chrysler FCA models:

Chrysler:
Pacifica 2018-2020
300  2018-2020
300C 2018-2019
Town & Country 2018

Dodge:
RAM 2018-2021
Durango 2020-
Challenger 2018-2021
Journey 2018-2019
Charger 2018-2021

Jeep:
Grand Cherokee 2018-2020
Cherokee 2019-
Compass 2017-
Wrangler 2018-2020
Renegade 2018-2020
Gladiator 2020-
Commander 2018-

Select model and year, vvdi key tool plus will show you the programming procedure.

Here are examples:

Xhorse VVDI Key Tool Plus Program Jeep Wrangler 2020 All Keys Lost