<script>
( function( $ ) {
    $( document ).ready( function() {
        var productImage = $( '.et_pb_tab_content .et_portfolio_image .et_pb_gallery_caption' );

        function setHeight( el ) {
            var maxHeight = 0;
            if ( el.length ) {
                el.each( function() {
                    if ( $( this ).outerHeight() > maxHeight ) {
                        maxHeight = $( this ).outerHeight();
                    }
                } );

                el.css( 'min-height', maxHeight );
                console.log(maxHeight)
            }
        }
        setHeight(productImage);
    } );
} )( jQuery );
</script>