How to add custom filed value after in wp post title

It is a simple 3 step process:

1. Look for your post title markup that should look something like:

<h1><a href="https://wordpress.stackexchange.com/questions/311624/<?php the_permalink(); ?>"><?php the_title(); ?></a></h1>

2. Now, get your post custom meta value through:

<?php $bannerContent = get_post_meta($post->ID, 'bannerContent', true); ?>

3. Next add this value to your title where ever you need:

<h1><a href="https://wordpress.stackexchange.com/questions/311624/<?php the_permalink(); ?>"><?php the_title();  echo $bannerContent; ?></a></h1>

This is it. If you need any further assistance, please let us know!
Happy coding