Sorry, I guess I’m not clear on what the flow is in your scenario.
Is this the gap you are referring to? Are you wanting to dynamically determine the set of expression libraries to import? More specifically, are you wanting to change the number of libraries you want to import or dynamically determine the library to import? The former is not supported at the moment, the platform can only import a fixed number of libraries, you can’t import N extra libraries at invocation. The latter is supported, you can make the library path an expression and use pipeline parameters to choose which library to import. You can also “overlay” libraries, so you could have a library with a default set of expressions and then overlay a second library with more specific values for a particular business.
I was thinking you would have one library file and updating the expressions in that as the rules were changing.
Also, how are you invoking the pipeline? With a scheduled task?