In the menus:Very few makers support that. If you used a more advanced control system that used serial or IP to control the TV you could probably handle it, but no magic remote cursor stuff that way.
Strangely I was under the impression that the LG remote did most things by RF not IR, so I am actually surprised if there is much interference between them.
General -> About this TV -> Set ID: has a slider from 1 to 99.
I thought that changing the IDs so that they were different numbers allowed more than 1 TV to be in the same room?
TiVo has had a similar option since it first launched in 1999! That's 20 years ago. Should be common, disappointing that it isn't.