Irvin,  in my testing this is an automatic feature of tables.  In a drawer, when you conditionally render components  based on fields that are in the model that drives the table,  the row context will be automatically taken into account.  

Example:  In drawer of accounts, only show a particular component when account is of type “foo”.
- When you open drawer of account  A - of type “foo”  the component will show. 
- When you open drawer of account B - of type “bar” the component will NOT show. 

Am I missing some complexity in your use case? 

I have a table of line items. Within one of the drawer tabs, I have several tables of another sobject. So two models. I want to conditionally render these tables based on context LineItem.Field == ‘some value’. Does this make sense? According to the help text it will use the first row, not the context row.

Rob, So I went back and double-checked my models and changed all the table rendering rules to use QuoteLineItems so that the line item in context would be used. Yes, it worked. Awesome. Thanks. Regards, Irvin

Thanks for pointing out the need to change our help text!