Create schema attributes for brand, color and material

Hi Tom,

If I want to add a filter in functions.php to create a brand schema that will follow the schema guidelines https://schema.org/Brand and the meta key I want to use to get the brand name is wpfoof-brand what would the snippet look like?

I would really like to be able to also create two more structured data attributes – material and colour. If I use the meta keys for material and colour from woocommerce pa_colour and pa_material what snippets can I use to create structured data attributes for color and material that will be schema friendly and follow these guidelines https://schema.org/material and https://schema.org/color ?

Thank you in advance. I will buy the unlimited sites license if I can get these working even though I will only use the plugin on one website.