Magento 2 – Custom Variable | How to get the Plain Value as well as HTML value using directive {{CustomVar code=”CUSTOM_VAR_CODE”}} in CMS Blocks?

I have added the Custom Variable from Admin > System > Other settings > Custom Variables > Add New Variable, it is possible to add both the Variable HTML Value as well as Variable Plain Value as in the screen shot below

When using the directive {{CustomVar code=”CUSTOM_VAR_CODE”}} in Content > Static > Blocks it always retrieves the Variable HTML Value, but there is no way or documentation on how to retrieve the Plain Value using directive {{CustomVar code=”CUSTOM_VAR_CODE”}} ?

Please share thoughts