make.conf itself does not have a way of specifying options for specific ports. It does generally allow specifying different options for building the kernel, source tree and ports in general, but not specific ports.
However, the portconf port ports-mgmt/portconf does. Based on it's config file, it will splice in make.conf variables based on the port you are building. It is simple, and works well. I recommend you take a look at it.
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