The (industry) syntax which is available is quite broad. It will be highly unlikely that you won’t find anything to suit you there. Essentially, use what you can until it is developed. A recent example is the W3C approved markup for auto manufacturers. That was quite sparse, and it was developed recently in a more detailed way. Before that, they were using what they had. When you are unsure of the best industry syntax, try implementation first on one or two pages, and test. A close eye will help you know if your new code is adding clarity to users and search engines. Then add your industry schema site-wide. The technical process of eCommerce schema implementation is all about creating a structure for humans that are looking for a specific piece of information. Schema is built on strong entities and topics that service your clients and search engines at the same time. A lot of web designers that create beautiful-looking sites still that don’t have a good semantic base. Search will surface the most relevant information within your industry that answers the query. You have to have evergreen content that clearly supports your choice of industry syntax and makes sense to humans first. Then, the application of schema can be applied.