This capability is demonstrated in a sample OpMode linked here:
https://ftc-docs.firstinspires.org/en/latest/apriltag/vision_portal/vision_multiportal/vision-multiportal.html
The sample is in FTC Blocks. A Java user can read the documentation, the code and the code’s in-line comments, to replicate this in OnBot Java or Android Studio.
Pay close attention to the use of Android’s “Viewport ID”. Note that FTC Blocks lists begin with index 1, while Java lists begin with index 0.