When scheduling an analytical app on Gallery, there is no UI for submitting app values. This significantly limits the value of scheduling workflows and using analytical apps. With this feature, it would allow our users to have more flexible scheduling while also simply maintaining one workflow. Because this feature doesn't exist, we have had to build workarounds by either creating multiple workflows or utilizing APIs.
Since this feature is already available for manual runs and APIS (shown below), it shouldn't be a reach to also have this feature when scheduling a run.