After a bit more digging I found Using shortcode code1.html within an other shortcode code2.html which seems to confirm this is not possible and the content I want to reuse in multiple shortcodes needs to be added as partials.
After a bit more digging I found Using shortcode code1.html within an other shortcode code2.html which seems to confirm this is not possible and the content I want to reuse in multiple shortcodes needs to be added as partials.