Hello.
There are a couple forum members who have posted their code for multiple sensors, such as oleglyan in this post (note that this code is for the VL53L0X, but the general idea is the same). However, we only recently released the ROI support for our VL53L1X library and do not yet have any specific examples showing how to use that. What have you gotten working so far and what part is giving you trouble? Could you post your sketch so far with a description of what happens when you run it?
Brandon