Shortcode for custom post type title

Are you trying to display the current post’s title dynamically in some way? or perhaps inside its own post content? Or somewhere else?

Not quite sure on the usecase here, which would help me provide a better answer.

Something like this should work

add_shortcode( 'post_type_title', 'nick1999_post_type_title' );
function nick1999_post_type_title( $atts ) {
	$atts = shortcode_atts( [
		'post_type' => '',
	], $atts );

	if ( empty( $atts['post_type'] ) ) {
		return '';
	}

	$obj = get_post_type_object( $atts['post_type'] );

	return $obj->label;
}

Usage example: [post_type_title post_type="movies"]

Would return: Movies if the plural label is as such. Editing the plural label later would affect all of the instances of the shortcode.

Glad we could help. Let us know if anything else comes up.