export theme settings

I like the theme, but have a little problem: for reasons i should make a child theme (because of woocommerce templates). unfortunately i did the whole setup in the main theme, confident, that they would be read by the child anyway. well now i know they aren’t. Is there any nice way to make the child theme use the customized version of onepress? would it help to buy the plus-plugin? i could not find an export function for settings there either, but of course I would buy the plugin if it will solve this issue. please advise! i’m not afraid of editing php just don’t know where to start and don’t want to reverse engineer the whole theme. probably i would just need to add something to the childs function.php. but what?

thank you very much.