INA229: Do input signal and chip supply GND need to be tied together

Tool/software:

Hi, Please see the attached circuit diagram. I only need to measure Vdiff, so Vbus is not connected to anything. My input signal circuit is a 15V peak-to peak sine wave at 60Hz, which is divided by 10 with the resistive divider, leading to a Vdiff in the range of [-0.15, +0.15]V.  Since I am not interested in Vbus, can I leave the input circuit ground unconnected from the INA229 power supply ground? If so, how would Vcm be calculated? Thanks!