Hello @opradas,
I am sorry for the confusion, the like format post directly displays the link on the post details page and post list page.

To add the external link or custom link to the post title, would require custom development which is outside the scope of support.
To give you something to start with you can copy the file wp-content\themes\pro\framework\views\{STACK}\content-link.php
to your child theme wp-content\themes\pro-child\framework\views\{STACK}\content-link.php
then find the_permalink
in the else statement and change it with echo $link
.
Go to line number 25 (Example code is bassed on integrity stack and it is only for Post List page or Post Archive Page ) of the file that I mentioned
Replace this code with this code
<div class="x-hgroup center-text">
<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to: "%s"', '__x__' ), the_title_attribute( 'echo=0' ) ) ); ?>"><?php x_the_alternate_title(); ?></a></h2>z
<span class="entry-title-sub"><a href="<?php echo $link; ?>" title="<?php echo esc_attr( sprintf( __( 'Shared link from post: "%s"', '__x__' ), the_title_attribute( 'echo=0' ) ) ); ?>" <?php x_output_target_blank(); ?>><?php echo $link; ?></a></span>
</div>
Replace by this code
<div class="x-hgroup center-text">
<?php if($link != ''){ ?>
<h2 class="entry-title"><a href="<?php echo $link; ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to: "%s"', '__x__' ), the_title_attribute( 'echo=0' ) ) ); ?>"><?php x_the_alternate_title(); ?></a></h2>
<?php } else{ ?>
<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to: "%s"', '__x__' ), the_title_attribute( 'echo=0' ) ) ); ?>"><?php x_the_alternate_title(); ?></a></h2>
<?php } ?>
</div>
Please note that the code provided in the above thread serves as a guide only and is to help you in getting started so implementing it and maintaining the code will be out of our support scope and for further maintenance for new possible versions of the theme that may cause the customization to break, you will need to hire a developer.
Thanks for understanding