makeContent.EulerTags() pass.Acts as a quantity-only tag with combo_key = "". The complement label text
comes either from complement$label (user override) or from
container_data$quantity_label (the fitted complement count).
setup_complement_tag(container_data, complement, number)the complement (container) region's data
the complement parameter list, with a $gp and an
optional $label override
the diagram's region index, used to name the grobs