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.
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.
Send us a ticket, we will try our best to assist you with your problem