Discovering all components for ltm sub-module with REST (ex. loadBalancingMode)

I'd like to get all the available components for an ltm sub-module. For example, all possible loadBalancingMode values for pools.

I can pull the components of existing sub-modules. For example, I can pull the loadBalancingMode values of created pools:

https://[MGMT IP]/mgmt/tm/ltm/pool/?$select=loadBalancingMode

But this only gives me the loadBalancingMode of existing pools. I want to get ALL loadBalancingMode values, even ones not in use.

I can't figure out how to expose this component without a pool as context. Any ideas?