@kosamari FWIW, and since you've been dabbling with it already, you can have control over your headers on @Netlify by adding a _headers file to your repo. You have full control over your CSP headers.
https://www.netlify.com/docs/headers-and-basic-auth/#custom-headers
My tweets and posts live here on my own domain these days.
You can explore them here and follow me on Mastodon instead of Twitter where I'm not currently active.