HEIC in browser

<?php
$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => 'i',
  'trusted_domains' => 
  array (
    0 => '..com',
  ),
  'datadirectory' => '/data/olkedata',
  'dbtype' => 'mysql',
  'version' => '21.0.0.18',
  'overwrite.cli.url' => 'https://..com',
  'dbname' => '',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
  'app_install_overwrite' => 
  array (
    0 => 'occweb',
  ),
  'enable_previews' => true,
  'preview_max_x' => 4096,
  'preview_max_y' => 4096,
  'preview_max_filesize_image' => 50,
  'preview_libreoffice_path' => '/usr/bin/libreoffice',
  'preview_office_cl_parameters' => ' --headless --nologo --nofirststartwizard --invisible --norestore --convert-to png --outdir ',
  'enabledPreviewProviders' => 
  array (
    0 => 'OC\\Preview\\PNG',
    1 => 'OC\\Preview\\JPEG',
    2 => 'OC\\Preview\\GIF',
    3 => 'OC\\Preview\\HEIC',
    4 => 'OC\\Preview\\BMP',
    5 => 'OC\\Preview\\XBitmap',
    6 => 'OC\\Preview\\MP3',
    7 => 'OC\\Preview\\TXT',
    8 => 'OC\\Preview\\MarkDown',
    9 => 'OC\\Preview\\OpenDocument',
    10 => 'OC\\Preview\\Krita',
  ),
  'default_phone_region' => 'CH',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpauth' => 1,
  'maintenance' => false,
);