Filter hook for breadcrumb link texts, you can override or filter link text or title.

add_filter('breadcrumb_link_text', 'breadcrumb_link_text_20200203');

function breadcrumb_link_text_20200203($title){
    
    if(is_singular('post')):
        $title .= ' - Hello';
    endif;

    return $title;

}

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