I will be doing this also I only have 1 light under the driver feet.
My daughter did it in her car. She bought them from Amazon. It came with 4 led light strips with double sidded tape and wires that went back to master control that got plugged into an aux port. Also has a remote and you can change the colors. Cost her $30 and took about 15 minutes to install.
Personally I will be buying 12 volt led light strips and splicing them into the wiring of the one working light I have.
Jeep! not just a vehicle a way of life.