View subtitle (custom field) in homepage

I have created a Subtitle custom field and added this code in functions.php, but this way I can’t see the subtitle on the homepage, only on each individual post. Any ideas?:

add_action( 'wp_print_footer_scripts', function () {
	if (is_singular()):
		$subtitulo = get_post_meta(get_the_ID(), 'Subtitulo', true);
		if ( $subtitulo ):
		?>
		<script>
			(function( $ ) {
				let str = '<span class="dcms-subtitle">';
				str += '<?= $subtitulo ?>';
				str += '</span>';
				$(str).insertBefore('.entry-title');
			})( jQuery );
		</script>
		<?php
		endif;
	endif;
} );

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