Is it possible to mix explicitly defined list items with a dynamic documentList in the structure builder?

S.listItem()
  .title('Child Pages by Parent')
  .icon(RiPagesLine)
  .child(() =>
    documentStore.listenQuery(`*[_type == "page" && defined(content.main.parent._ref)]{'parent': content.main.parent->}`).pipe(
      map(allParentPages => {
        // Filter array for unique values since the query will return
        // the parents of all children so there will be duplicates
        const parents = allParentPages
          .filter(
            (parentDocument, index, array) =>
              array
                .map(mapObj => mapObj._id)
                .indexOf(parentDocument._id) === index,
          )
          .map(uniqueParents => uniqueParents.parent);

        const parentListItems = parents.map(parent =>
          S.listItem()
            .title(parent.content.main.title)
            .icon(RiPagesLine)
            .child(
              S.documentList()
                .title(parent.content.main.title)
                .schemaType('page')
                .filter('content.main.parent._ref == $parentId')
                .params({
                  parentId: parent._id,
                })
                .child(S.document().views(Views())),
            ),
        );

        return S.list()
          .title('Child Pages by Parent')
          .items(parentListItems);
      }),
    ),
  ),