Or a high side current sense amplifier... https://www.st.com/en/amplifiers-and-comparators/tsc1031.html https://www.st.com/en/amplifiers-and-comparators/tsc103

Or a high side current sense amplifier... https://www.st.com/en/amplifiers-and-comparators/tsc1031.html https://www.st.com/en/amplifiers-and-comparators/tsc1031.htm... Hall sensors drift.