Splitting brute force keyspace

I have small feature request (unless it's already implemented?). I use both john and hashcat in custom solution for distributing password cracking. I have pretty good results (all nodes finish with similar ETA) by splitting dictionary by number of lines (as a percentage of nodes computational power). However I have an issue while splitting keyspace in brute attack. Itried using simple letters (for example one node a-k and other l-z) but it's pretty hard to implement and often unreliable. I noticed hashcat has some options for splitting the keyspace itself. It would be nice to have something like that in john. Relevant link:
https://hashcat.net/forum/thread-3386.html

Start by reviewing the existing John the Ripper distribution options and the linked hashcat forum discussion about keyspace splitting. The issue names no files, tests, or entry points; done would require a defined, reliable way to divide brute-force keyspace across nodes and project-specific validation of that behavior.