Add Content below Title for Posts page inside div.posts-page-description in Genesis. https://sridharkatakam.com/adding-content-title-inside-div-posts-page-description-genesis/

functions.php

// Bring back the missing editor for Posts page
add_action( 'edit_form_after_title', 'rgc_posts_page_edit_form' );
function rgc_posts_page_edit_form( $post ) {

	$posts_page = get_option( 'page_for_posts' );

	if ( $posts_page === $post->ID ) {
		add_post_type_support( 'page', 'editor' );
	}

}

remove_action( 'genesis_before_loop', 'genesis_do_posts_page_heading' );
add_action( 'genesis_before_loop', 'sk_do_posts_page_heading' );
/**
 * Add custom headline and page content to assigned posts page.
 *
 * If we're not on a posts page, then nothing extra is displayed.
 *
 * @since 2.2.1
 *
 * @return null Return early if `headings` is not enabled for Genesis accessibility, there is no
 *              page for posts assigned, this is not the home (posts) page, or this is not the page found at `/`.
 */
function sk_do_posts_page_heading() {

	if ( ! genesis_a11y( 'headings' ) ) {
		return;
	}

	$posts_page = get_option( 'page_for_posts' );

	if ( is_null( $posts_page ) ) {
		return;
	}

	if ( ! is_home() || genesis_is_root_page() ) {
		return;
	}

	$title = get_post( $posts_page )->post_title;

	$content = get_post( $posts_page )->post_content;

	$title_output = $content_output = '';

	if ( $title ) {
		$title_output = sprintf( '<h1 %s>%s</h1>', genesis_attr( 'archive-title' ), get_the_title( $posts_page ) );
	}

	if ( $content ) {
		$content_output = wpautop( $content );
	}

	if ( $title || $content ) {
		printf( '<div %s>', genesis_attr( 'posts-page-description' ) );
			if ( $title ) {
				printf( '<h1 %s>%s</h1>', genesis_attr( 'archive-title' ), get_the_title( $posts_page ) );
			}
			echo '<div class="posts-page-intro">'. $content_output .'</div>';
		echo '</div>';
	}

}