How do I apply custom fragment shader to raster tile on MapBox GL JS?

I have png data tiles like dem and I want to display it on Mapbox GL JS through my custom fragment shader.
I cannot find the way to use custom shader for 'raster' layer. I find examples of CustomLayerInterface, but I do not know in case of using raster tile.
Any help would be appreciated.
Sorry for my poor English. Thank you.