Is it possible to automatically add the ‘Product Tags’ to the product description using a metafield or some other way to avoid having to add them all manually?
You could add them to your product template after the product description by doing something like this with Liquid:
{% for tag in product.tags %}
{{ tag }}{% unless forloop.last %}, {% endunless %}
{% endfor %}
If you put that immediately after your product description it will show the products tags, separated by a comma. Then you can style it with the “product-tags” class in your custom CSS file.
You can find where your product description is inserted into your product template by searching for {{ product.description }} in your theme files… it could be in a Section called product.liquid, or a Snippet something like product-form.liquid.
unfortunately google does not detect the result of this code as meta tag