How can I use HTML in product page meta text fields?

In the product.json file one of the metafields looks like this. I looked through the main-product.liquid but didn’t see any mention of the metafiles added.

“e5f5939a-f28e-486a-b73b-c9f702a0aeba”:{
“type”: “collapsible_tab”,
“settings”: {
“heading”: “DETAILS”,
“content”: “

{{ product.metafields.my_fields.details | metafield_tag }}</p>”,
“page”: “”,
“icon”: “none”
}
},