Pod seller here. I have created some good mockups using AI and canva. How do i get realistic engraving effect on silver or gold dog tag necklaces? Thanks.

Would not use drop shadow.
Engraving is imprint, drop shadow makes the effect look raised (emboss).
The shadow needs to be cast inside the text on same side the light is coming from, We had inner shadow in 2.10 (LayerFX), but is there already inner shadow in Gimp3? Don't know, will investigate later.

Edit: Quick test with Bump Map.

1. Type your text, use slightly darker gold than the polished surface of your shiny plate. The bigger the better, because after rotating you switch to perspective tool and that means downsizing.
2. Filters: Map-> Bump Map. Note the direction of light, and remember to select the aux input (same text layer), or nothing will happen.
3. Filters: Noise-> CIE Ich Noise. Because there will be always little scratches. When I engrave with laser it leaves sometimes these super tiny ridges between the beam scans but that's not necessary to mimic.

We could make it better (try a bit different numbers yourself), but this is something like it would look if engraved with a laser.
I've been engraving for about 30 years, but mostly rubber, wood and multilayered plastic.
The old school military dog tags were done with graphotype machine, and it was embossing. Letters were raised.

In version 3 there is in text styling which I think is a GEGL function
Oops that was 'inner glow'

2.10 has some chisel scripts, Dont know about 3 yet

Thank you sallyanne, Seems I had added some GEGL in the GEGL folder Beaver has posted. Will check it out.

I also have a tutorial on creating an engraved effect. For Gimp-2.10 though. And you need the layer effects py plugin.
viewtopic.php?f=23&t=428

Thought I just add this small round brass seal, it was engraved with old CNC machine.

With version three I did a Map>bump map>Linear inverted