In version 5.3.0 we are introducing feature allowing to add scheduled issues to currently Active Sprint.
You can set it up in the 2nd step of the wizard, instead of fixed sprint choose Active Sprint
Here is an example of Active sprint and pending scheduled issue:
When trigger is fired and issue is created it is automatically added to active sprint:
In case there is no Active Sprint, issue will be added to the backlog:
When the sprint start, new issue will be added to it:
It will not work, if the parallel sprints feature is turned on.