[Discussion] ACEScg in CIE 2015 (CIE 170-2) coordinates?

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Unsure if this is the right place for this. If not please feel free to close this issue.

I'm referencing this document (links to CIE) and this document (PDF). Usually referred to CIE 170 (or CIE 2012 or CIE 2015 depending on source).

Basically CIE 170-2 (and the preceding CIE 170-1) defines a set of new LMS cone fundamentals and a new set of colour matching functions, specifically aimed at address CIE 1931 problems when applied to modern wide color gamut displays with narrow band primaries (e.g. OLED, QD-OLED, laser displays).

There are new display color calibrators from konica minolta adhering to the CIE 170-2 standard.

The issue is that ACEScg is not defined spectrally, rather they are defined using xy coordinates given in CIE 1931 space. The question I have is, if we were to target CIE 170-2, how should we do this mapping? Rec 2020/2100 can be mapped to the CIE 170 without issue as it does define spectral primaries.

See also:
[1] Reducing the CIE colorimetric matching failure on wide color gamut displays
[2] The Pitfalls of Wide Color Gamut Displays
[3] Improvement of Monitor Calibration Using Other than CIE 1931 Color Matching
[4] Evaluation of colour differences from LEDs in new colour systems
[5] Sony consumer calibration with CIE170