How can I change the table of contents to include the relevant chapters in different parts?

[quachpas]

@Andrew_Duncan

And for example when you collapse part_1 in the table content, chapter_1, chapter_2, chapter_3 and chapter_4 shall appear. So basically, chapter_1, chapter_2, chapter_3 and chapter_4 are children of part_1 but still look heading 1.

I think @Andrew_Duncan is looking for this: Part independent section - #6 by Andrew.

@Andrew_Duncan Typst does not have “part” or “chapter” like LaTeX’s report/book. Instead your part/chapter should be heading level 1, and the rest lower levels. See the link above for more details!