Description of problem:

Today fetch:response:default only supports a static string. Customers need to set the default selection based on the fetch response itself (e.g., a field in the response that marks the selected item).Enhance fetch:response:default to accept a selector/expression (jsonata) against the fetch response. If the selector resolves to a valid option, set it as the initial value when:

• fetch:skipInitialValue is not true

• the user has not changed the field yet

If fetch:response:default is still a static string, keep existing behavior.Acceptance criteria:

• fetch:response:default supports either:

• static string value, or

• selector string evaluated against fetch response

• If selector result matches a fetched option, it becomes the default selection

• Respects fetch:skipInitialValue and isChangedByUser

• Add tests for selector default and fallback behavior

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

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Actual results:

fetch:response:default only accepts a static string; it cannot be derived from the fetch response, so default selection must be hardcoded.

Expected results:

fetch:response:default can be a selector/expression evaluated against the fetch response (as well as a static string), allowing the default option to be chosen dynamically from the response.

Reproducibility (Always/Intermittent/Only Once):

Build Details:

Additional info (Such as Logs, Screenshots, etc):