Cycles is a more realistic (and slower) renderer than many realtime renderers. To get the same results in other viewers you have to bake things. You can bake the AO, or bake the entire base color texture with all lighting included. There are some addons that may help automate the baking (see GLB Texture Tools - Lightmapping, Batch Image Scale, Quick Export - #11 by LdelMar) but I haven’t used these to recommend one.
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