Basically, there is no good way for someone building a data model in Power Query (or dataflows) to provide downstream documentation of column and table intent to consumers/users of those data models in a Semantic model context. Meta data can be attached to columns in Power Query, but there is no way to expose that meta data in the Semantic model context. Therefore, even if I document what the columns are, while building my model, I have to go back and 're-document' in the Semantic model in the description field for the column(s).
For more detals see this thread: Can I dyanmically set Column Description in Power Query
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