Next Sprint JQL filter

As a team leader, when I plan the next sprint I need to see how many hours each developer has available. Currently, I use a pie chart that shows me time for each team member based on a JQL filter, however, I have to create a filter for every sprint for that, which is inconvenient and cumbersome.

To solve this issue, I would like to have the ability to create a filter 

Sprint in nextSprint()

 that will show me the next sprint, similar to 

Sprint in openSprints()