@bulent,
Yes, it is possible, but the question whether it is wise or even necessary to do so.
Consider, for instance, the identification of Plesk: Wappalyzer identifies
- Plesk Panel by analyzing the URL: scripts, icons etc.
- Plesk driven sites by analyzing the headers: "Powered by PleskLin" or "Powered by Plesk"
that is, if I am not mistaken, since it has been a while since I tackled this extension.
So, changing the default Nginx template or creating a custom Nginx template without the before mentioned headers would or could do the trick.
With respect to the php information, I believe to recall that it was as simple as introducing expose_php=off in the php.ini file.
In short, you can try both for a particular domain.
Please let me and all of us know whether this actually solved your problem and/or answered your question.
Regards......
PS Forgot the following: when testing the before mentioned "solution", clear and/or bypass browser cache, otherwise you will get "old" results that are stored in cache!