How to add AMP page linking in head?

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I've read through the documentation but didn't find AMP support.

I'm using hexo-generator-amp plugin to generate the AMP pages for posts, and according to its README.md, I have to add the AMP page linking to pair normal version with the AMP-ed version:

<% if (is_post() && config.generator_amp){ %>
  <link rel="amphtml" href="<%= config.url %><%= config.root %><%= page.path %>/amp/index.html">
<% } %>

As you can see, the <link> need to contain the URL of the page so I can't use head.yml to achieve this.

Any idea or plan to support this feature?