I am (slightly) contemplating this (see also Reddit discussion: https://www.reddit.com/r/programming/comments/oe9oia/wikiped...). But currently I am mostly focused on deducing atomic selectors that would be useful and choosing their interaction. The particular syntax is kind of afterthought.

Though, I should say that I am still not sure GraphQL's mental model would work here (WikipediaQL for now structured around "which part of the document to choose and how to transform it", with "where to put it" being the final statement just of some branches; with GraphQL, as far as I can understand, each node is "where to put it"-first, and it _may_ lead to clumsy and repetitive queries).