Well first you need the world to be compatible with java edition. When you are able to open your world in java edition 1.8 or 1.12 for example. Then you should be able to load it in nukkit as well and use worldfixer to convert blocks
If I understand correctly it's not an easy task. Since you have to track all the items to be able to revert it back without duplication. I would say it's almost impossible to do properly.
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