Accessing sku in a query

Hi,

I have a simple query like this:

{"query":"{products(first:10,query:\"title:*brace*\"){edges{node{title}}}}"}

If I want to search the product inventory SKU field, instead of title, it seems it needs an alternative syntax as the SKU is a product variant, as the query:

{"query":"{products(first:10,query:\"sku:*brace*\"){edges{node{sku}}}}"}

as it comes back with Field ‘sku’ doesn’t exist on type ‘Product’".

I’ve tried a few different ways, but the syntax eludes me. Does someone have the syntax to search a SKU?

Does this seem correct?

{"query":"{productVariants(first:1,query:\"sku:SKU727\"){edges{node{product{title}}}}}"}