How to modify custom attribute of a product with JSON (Postman) Magento 2

thank you for reading me.

Is there a way to modify a product´s custom attribute?

I´m using postman, i use JSON POST for price and stock but i can´t find the way to update a custom attribute of a product.

Can it be done inside: {{magento_site_path}}/rest/default/V1/products/{{sku}} ?

What would be the Body of the POST request?