Redirect blog post URL to another blog post URL in a new domain

Hello everyone,

Today, I faced a problem with redirect in the Yaml File.
I wanted to redirect an old post to an URL in a new domain, but apparently, the syntax is either incorrect or it is impossible to make it in Yaml File.

exemple : /20-km-bruxelles-a-lenvers/: https://journaldefreelance.site/20-km-bruxelles-a-lenvers/

And it turns out that way : https://journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/journaldefreelance.site/20-km-bruxelles-a-lenvers/

Please, share me a documentation which describes it because I haven’t found it in official Ghost one.

Do you have any idea about how I can solve this problem ?