The Scalability Groups found in the Settings List (gear icon) includes Landscape and Textures. However, the Get Game User Settings BP node does not have the corresponding Get/Set Quality nodes for Landscape and Textures.
There is also a Material Quality Level (Low - Epic) in the Settings List. But I don’t see how to access that in BP either.
I don’t have that version of the engine but these are the nodes, Material Quality is part of “Visual Effects”, For some reason, these nodes do not appear with context sensitive enabled