Separator
The simplest way to group related fields is to use ui.separator which visually divides form into subsections.
q.page['example'] = ui.form_card( box='1 1 2 4', items=[ ui.separator(label='Separator 1'), ui.text('The quick brown fox jumps over the lazy dog.'), ui.separator(label='Separator 2'), ui.text('The quick brown fox jumps over the lazy dog.'), ui.separator(label='Separator 3'), ui.text('The quick brown fox jumps over the lazy dog.'), ])
Check the full API at ui.separator.