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There should be a shipped example of a PNG8 setup. #15800
Even the source code is unclear about how to set up the metadata properly, so the best would be to extract it from an already existing PNG, but there isn't such in the first-party.
The best suggestion I would make in this regard is to port the lighthouse from RA to TD, but letting it stay within RA palette, so that it can feature both usecases as an asset and as a palette.
Hope this helps as example :)