setting up custom headers

Hello! I have site on WordPress on OLS. I want to set headers for html only. For example: "link <font as font>" (server push) If I paste code into "Header operation" in "Context", this headers applies on all static content (css, js, etc) URI* set "/" How I apply this code only for my webpages?

Hi, I go to /wp-admin/admin.php?page=litespeed-cache And I see "NOTICE: OpenLiteSpeed users please check this: Setting Up Custom Headers" I did everything according to the instructions https://openlitespeed.org/kb/how-to-set-up-custom-headers/ But nothing works. the inscription is still there...