There isn’t a single point in GPULM where you just ‘insert HLOD code here’ and then things magically work. The person needs a more throughout understanding of how GPULM works.
@yujiang.wang it was just a matter of time How to Get GPU Lightmass Working with HLODs? 
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Well, I may add support for WP HLODs in the future. But they are very different from 4.27 HLODs.