INA381: How does the input offset voltage scale with Vcm?

Hi TI experts,

The INA381's datasheet specifies two input offset voltages:±150 µV at Vcm = 0 V, and ±500 µV at Vcm = 12 V.

I'm trying to use the INA381 in an application where Vcm is not 0 V, but is also much less than 12 V. In my efforts to characterize the circuit's tolerance, is it reasonable for me to linearly interpolate the input offset voltage between 0V and 12V? e.g., if Vcm is 5V, can I assume a worst-case input offset voltage of: (500 - 150) / 12 * 5 + 150 = ~300 µV, as long as VS+ is greater than Vcm?

For my application, I would strongly prefer the input offset voltage to be less than 250 uV, but TI doesn't appear to make current sense amplifiers with alert functionality that have an input offset voltage that low (yet). My Vcm is low, though, so I wonder if I will be close enough to my target input offset voltage, despite the published specifications.