Override mime configuration in /etc/foreman-installer/custom-hiera.yaml

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Problem:
Hello,

I would like to override the mime configuration of apache please.
I do not know if the right location to do that is /etc/foreman-installer/custom-hiera.yaml
I tried this in it :

apache::mod::mime:
  mime_types_additional: {'AddType'         => { 'text/html' => '.shtml', 'text/plain' => '.yaml', }}

The original content is in
/usr/share/foreman-installer/modules/apache/manifests/params.pp :

  # Default mime types settings
  $mime_types_additional = {
    'AddHandler'      => { 'type-map'  => 'var', },
    'AddType'         => { 'text/html' => '.shtml', },
    'AddOutputFilter' => { 'INCLUDES'  => '.shtml', },
  }

Thank you in advance for your help.

Expected outcome:

Foreman and Proxy versions:
1.18
Foreman and Proxy plugin versions:

Distribution and version:

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