[NTG-context] A book with sections

I’d like a book with chapters to have sections/parts, e.g. something that groups a few \chapter elements together. Is there support for this in LMTX? I.e. in such a way that it also shows up in the table of contents? Thanks, Gerben Wierda (LinkedIn https://www.linkedin.com/in/gerbenwierda) R&A Enterprise Architecture https://ea.rna.nl/ (main site) Book: Chess and the Art of Enterprise Architecture https://ea.rna.nl/the-book/ Book: Mastering ArchiMate https://ea.rna.nl/the-book-edition-iii/