Well, I just only want to fix my issue. Enabling HTTPS in my Qt project, no matter what and how many process in Qt to enable this its fine, at least I've learn something.
The current pre-built distribution binaries from Qt.io are designed to use the OpenSSL libraries at run time if they are present (thereby supporting HTTPS) or fallback to no HTTPS support otherwise. If your system has compatible OpenSSL libraries installed in a default location then this should Just Work. I assume that is also true for the somewhat ancient version (Nokia vintage?) you are using.

Perhaps you could check what version of OpenSSL your system has installed and where.