Yes the idea you have is partial solution already. What you need to do is copy the following to the <head> area of your posts template;
<meta property="og:url" content=" https://www.plantbasednews.org/post/5-surprising-studies-that-prove-veganism-is-growing-around-the-world" />
You will then highlight the last part of the url (5-suprising-…) and click add field and select slug as shown below ;
You should end up with this and you should be good to go;
