The new Minecraft update that released RTX Shaders broke other shader texture packs, and I believe now you need an RTX card to turn on those RTX exclusive features, which I assume would turn on shaders. If this is intentional, then it's idiotic that you need and RTX card to use third party shaders, plus I believe you can only use these RTX shaders on a RTX enabled world. If this is a bug, please fix it.
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Does Render Dragon support community shaders?
Currently, Render Dragon does not support 3rd party community shaders. Any community shaders previously used on Minecraft for Windows 10 may not run on a Render Dragon version of the game.
https://help.minecraft.net/hc/en-us/articles/360052771272-About-the-1-16-200-Update-for-Windows-10-#communityshaders