छो (Bot: Replace deprecated <source> tag and "enclose" parameter [https://lists.wikimedia.org/pipermail/wikitech-ambassadors/2020-April/002284.html])
Raw information about the members of a category, their sortkeys and timestamps (time when last added to the category) can be obtained from the [[mw:API|API]], using a query of the form:
Listings of up to 500 members are possible. If there are more members then the results will include text near the end like this: <
This can be added to the previous one, without quotation marks, for the next page of members: <code>...&cmcontinue=page|NNNN|TITLE</code>.