Problem Definition
When you close a sprint in the web interface, and it contains issues that were not completed, then you are prompted to then tell Jira Software where to place those incomplete issues (ie. to the backlog, into an existing future planned sprint, or possibly create a new sprint to add these issues to that).
However with the current REST API, you can not use any parameter into the endpoint
that would allow you to do this when closing the sprint via REST call. See https://developer.atlassian.com/cloud/jira/software/rest/#api-sprint-sprintId-put for complete parameters that are valid for this call.
Suggested Solution
It would be helpful if the REST API was updated for Agile/Software to include this as a possible option
Why this is important
It would be helpful for integration/automations that handle sprint management to be able to do this same function that end users using the web gui can perform.
Suggestion