On Commons template and module pages we have /doc pages for documentation. I think we need those for the pages in Data namespace. We could document format, purpose of the page, and who is supposed to use it.
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This would also be useful for adding a basic visualization of the data for some kinds of tabular data. For example, many of the Data talk: pages in https://commons.wikimedia.org/wiki/Category:Tabular_data_of_COVID-19_cases contain time series graphs of the case tables.