Hello,

yes, open /sections/portfolio_section_item.php and replace line 53

<h2 class="item-title"><?php the_title(); ?></h2>

with

<h2 class="item-title"><?php echo $hero_caption_title; ?></h2>

were $hero_caption_title you would have to initialize previously with 

$hero_caption_title = grenada_get_post_meta( GRENADA_THEME_OPTIONS, get_the_ID(), 'grenada-opt-portfolio-hero-caption-title' );