Quote - I'm not aware of a 'secret formula' ...

It's not really much of a secret: the original formula was offered by Bagginsbill in the Node for Dummies thread some time ago:

def IF(test, tv, fv): return (1-test) * fv + test * tv
def SRGB(x): return IF(Color_Step(x, .00304), 12.92 * x, 1.055 * (x ** (1/2.4)) - .055)
def ASRGB(x): return IF(Color_Step(x, .03928), x / 12.92, ((x + .055) / 1.055) ** 2.4)

Since then, I've seen a different permutation of this but since I didn't come up with that formula, I don't feel within my rights to share it without permission.

From that discussion, I did get the impression that a number of different colour-correction mechanisms could be employed (not simultaneously, of course), depending on what the lighting conditions were and what the artist wanted or needed to achieve.
However, this has nothing to do with monitor calibration or the sRGB standard, which is how images and colours originate. How Poser uses those colours is what I believe these contrivances address. Might be wrong, of course. There's probably still some key point I'm not grasping.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks