Request: ETTR for the RAW 2:20

[KelvinK]

When ETTR calculate exposure it uses fully 1920x1080. But since we've many cameras that use much less portion of the frame for recording, is it possible to calculate it for actual frame size in RAW? We often put bright objects (sun, lamps) at the top for example - out of the frame, so it doesnt effect on recorded frame, but ETTR logically calculate these bright objects as part of the frame.
Basically idea to calculate ETTR from the frame size with crop-marks for example 2:20 or 2:35.

Thanx.

[a1ex]

Already requested/discussed.

Finding the link is left as an exercise for the OP.