This is not possible yet, but our upcoming Forms v2 project does include this capability.
<%= heading %>
<% } %>
<%= heading %>
-
<% blocks.forEach(function(block, index) { %>
-
<% if (imageHeight) { %>
<% } %>
<% if (block.name) { %><%= block.name %>
<% } %> <% if (block.description) { %><%= block.description %>
<% } %> <% if (block.linkText && block.html_url) { %> <% } %>
<% }) %>