Add header.ejs file inside ejs-locals header block

Question

Add header.ejs file inside ejs-locals header block

I do not know if this is possible or not. Please give me an offer. My question is: how to add (enable) header.ejs inside the header block ejs-locals?

boilerplate.ejs

<!DOCTYPE html>
<html>
  <head>
    <title>It me</title>
    <%-scripts%>
    <%-stylesheets%>
  </head>
  <body>
    <header>
      <%-blocks.header%>
    </header>
    <section>
      <%-body -%>
    </section>
    <footer>
      <%-blocks.footer%>
    </footer>
  </body>
</html>

index.ejs

<% layout('boilerplate') -%>
<% script('foo.js') -%>
<% stylesheet('foo.css') -%>

<h1>I am the  template</h1>
<p class="better-than-dead">I'm red if foo.css was loaded.</p>
<p>Here are some muppets we know about:</p>

<% block('header', "<p>I'm in the header.</p>") -%>
<% block('footer', "<p>I'm in the footer.</p>") -%>