Fixes for output valueFrom due to outputs that pull from structs

[mr-c]

• fix the expression used by the output valueFrom hack
• add StepInputExpressionRequirement for valueFrom outputs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.35%. Comparing base (c9ac89a) to head (a0a2c3a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #242 +/- ## ========================================== + Coverage 94.32% 94.35% +0.02% ========================================== Files 7 7 Lines 846 850 +4 Branches 233 234 +1 ========================================== + Hits 798 802 +4 Misses 21 21 Partials 27 27 ```

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