key-value hash for epp template

How to porting next code from erb template to epp:

<%- if @mime_types -%>

# Custom additional mime types
<%- @mime_types.sort_by {|key,value| key}.each do |key,value| -%>
<%= key %> <%= value %>;
<%- end -%>
<%- end -%>

or how work with key-value hashes in epp templates. for example next code return error "Invalid EPP: Syntax error at '|'"

# mime.types.epp
<%- | Hash[String, String] $nginx::config::mime_types | -%>
<% include stdlib -%>
<% $nginx::config::mime_types.keys.sort.each |$key| { -%>
    <%= $key %> <%= $nginx::config::mime_types[$key] %>
<% } -%>

manifests:

# manifests/config.pp
class nginx::config {
  $mimetypes=lookup('nginx::mimetypes')
  file { "${nginx::params::conf_dir}/mime.types":
    ensure  => file,
    content => epp("${module_name}/mime.types.epp"),
  }

hiera:

nginx::mimetypes:
  video/ogg: 'ogv'

puppet version:

#puppet --version
5.0.1

Many thanks.