Enhancement: User-Defined Control Block Structures

[lcarcaramo]

Is your feature request related to a problem? Please describe.
Support extracting control blocks that are not known to CBXP via a user-defined JSON structure that describes the structure of the control block(s) (and potentially how to find it if it can be found relative to a known control block maybe...).

Describe the solution you'd like
N/A

Describe alternatives you've considered
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Additional context
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