The basic idea is bevelling text with the contour 'rolling slope desc.' and for the gloss contour 'double ring'.
I did the contour with layerfx but the gloss contour manually with curves, because you get better results.
Tried several contours: cone and cove deep.
All three results have G'MIC Light Glow on top.
If you want to study the effect, here is the xcf for all three versions: