Add a link token

Link tokens are very similar to text ones, except that they have a fixed value and they're invisible to the user. Usually they're used for enumeration, for example in item availability.

As usually, create a token and assign it a name and some Schema.org properties:

Then in your template overrides place the token wherever you want:

Example 5.6. Link Token

echo '{ VM_PRODUCT_IN_STOCK }'