How to exclude a Theme or Plugin from a higher level subscription that is available in a lower level

In Pro Sites subscription levels a higher level subscription INCLUDES everything that is a part of lower level subscription + whatever additional is offered for that higher level. For example if "LEVEL 1" includes plugins 1, 2 and 3 then "LEVEL 2" that is one level higher, AUTOMATICALLY INCLUDES plugins 1, 2 and 3 in addition to any other plugins that we may want to offer to "level 2" e.g. plugins 4 and 5.

MY QUESTION:

Is it possible to set up subscription levels in a way that each level has its own set of Themes and Plugins so that a Theme or Plugin that is offered for one level may not be available for a higher level?