it seems to be you are new to this concept. creating context nodes does not result in creating new entity.
first of all decide whether you can achive your requirement with just value node or you need to create model node.
if it can be implemetned with value node then you just need to create one table and based on table you can create new view in any ui component.
extending the already existing model, will require some understanding on genil model. what type of object we need to add key structure, attribute structure......
elaborate your requirement if it is possible.
