This was their response to me: You create the php.ini file in the cgi-bin folder. As far as I was advised the code that you have to enter is:
zlib.output_compression = On
And then you have to specify which in the .htaccess file which file extensions have to be zipped. However, I would advise on further checking how this can be done. If you are not familiar with Linux, I would recommend checking with a developer.

Also, I am currently on PHP 7.4, when I uploaded to PHP 8, my site crashed.

Rikard-

I did check the documentation, and did add classes, but can’t seem to get it to work.