While building a UI for a job-within-a-job isn't on the roadmap as of now, we're looking at a compromise solution similar to what we have for successful jobs. A direct link to the failed job in the callable recipe should be provided.
In addition to what Sen Rong gave, you can customize your job report to show the created child job URL. You can see more here: https://support.workato.com/solution/articles/1000229633-building-recipes-custom-job-reports.
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