server wold download and using vanilla shading with shaders

not the best title, but i have two questions:

if i download my server's world, and open it in singleplayer, is it possible to generate LODs for all generated chunks, for later use in said server? if so, i'm good with managing the files, but is there anything i'd have to do in-game or in the configs for it to work?

second, is there a way to have the LODs use vanilla minecraft's shading while using shaders for the real chunks?
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