How to Expose system configuration value to be used in CMS Pages/Blocks or email template

Expose system configuration value to be used in CMS Pages/Blocks or email template

as an example we will use this configuration "Delivery Methods / Free Shipping / Minimum Order Amount"

after you create a new module you will need to add this code to di.xml

  <type name="Magento\Variable\Model\Config\Structure\AvailableVariables">
        <arguments>
            <argument name="configPaths" xsi:type="array">
                <item name="carriers/freeshipping" xsi:type="array">
                    <item name="carriers/freeshipping/free_shipping_subtotal" xsi:type="string">1</item>
                </item>
            </argument>
        </arguments>
    </type>
   

then execute this command 

php bin/magento setup:di:compile