Difficult to answer, according to the Samsung list, ANT+ devices are compatible with the Watch7, but it is not known whether all data is transmitted.
Garmin only guarantees full compatibility with its own Garmin devices.
It is best to try it out with a chest strap from a colleague...

Have a look in the Watch7 settings... compatible devices are listed under "Accessories".
Good luck!

Hi, have you tried the watch with the chest strap? If so, does it work? I also have a Watch 7 and would like to buy the chest strap if I know that both work together.