It is very unlikely that the jade was heated to accept molten or hot glass for a repair; and unlikely that the glass was hot when it was placed there. It's more likely that a piece of glass (perhaps a bead) was glued into place—and that the stuff you see adjacent to the glass is the cement or gluing compound. You can verify this by testing its hardness. (Carefully and gingerly) tap that area against your front teeth. The cement will be softer than the stone or glass, and will make a "thud" sound (whereas the stone and glass will make a higher-pitched, almost ringing, hard sound). You could also judiciously use the POINT of a very sharp knife (like an X-acto) to pierce the tiniest excavation, that ought to crumble out—indicating it's a soft compound. Rotate the knife, rather than drawing it across the surface, for a minimal disfigurement.

Good luck. Jamey