Yes! This is a super common thing: setting up SYSTM with multiple Bluetooth sensors. I have a TICKR and a separate cadence sensor in addition to my trainer. Just be sure to set everything up from SYSTM—not in the Bluetooth connections in your tablet. If you need help with that, just ask.
I use an iPad and Kickr with SYSTM. I was using a Garmin HRM-Dual for a couple years, but starting after an iOS update in 2020, was unable to use the Garmin strap. It paired up with SYSTM, but the app never displayed a heart rate. Had to buy a Wahoo Tickr strap to get things to work again.