For breadcrumb, theme uses popular library named Breadcrumb Trail. You can find several hooks in the breadcrumb library. See vendors/breadcrumbs/breadcrumbs.php. Please be informed, that breadcrumb customization will need pretty good chunk of custom coding. You can create child theme and customize it. Here is the link regarding creating child theme. https://developer.wordpress.org/themes/advanced-topics/child-themes/
Ok, that will work. But I would like to remind you that, those direct changes of the theme will be removed when new version is released. So, we always recommend to use child theme for customization.