This has been asked a few times. From my understanding, the short answer is no, except maybe with some javascript, and there is a feature request which you should “like” if it would help you.
  
  
    I would like to insert a system variable in a post (for example site_name). 
If our site_name is OJODIGITAL, I had expected that when I insert in a post this text site_name would have been substituted for OJODIGITAL, but it is not. 
Hello friend, in our site %{site_name} you can see …. 
I have seen this kind of constructions in text customization messages (site adjustments/Customize/Text). 
Is it possible to do that? How?
   
 
  
  
    This is not possible at the current time.
   
 
  
  
    Here is my (somewhat clumsy) solution, in case it helps someone. I added this code under Admin > Customize > Themes > Edit CSS/HTML > /head: 
    <script type="text/discourse-plugin" version="0.8">
        api.decorateCooked($elem => {
            var i, j;
            var selector = 'https://example.typeform.com';
            // seems like this should work but it doesn't:
            // var typeforms = $elem[0].querySelectorAll('src^=[' + selector + ']');
            var ps = $elem[0].querySele…
   
 
  
  
    It would be great to be able to insert a system variable in a post (for example site_name). 
If our site_name is OJODIGITAL, I had expected that when I insert in a post this text site_name would have been substituted for OJODIGITAL, in a similar way that can be done in text customization (site adjustments/customize/text) 
Hello friend, in our site %{site_name} you can see ….
   
 
             
            
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