Ansible Group Vars Subdirectories

Hello is there a way to organize group vars in sub-directories? Strictly for readability purposes, when you have an Ansible project with a large number of group vars files it becomes very inconvenient to manage all of them under a single directory.

Currently:
Hosts file:
[a]
a-host
[b]
b-host

[c]
c-host
[d]
d-host

Current Group Vars Directory:
/group_vars
a-host.yml
b-host.yml
c-host.yml
d-host.yml

Desired Group Vars Directory Structure:

/group_vars
e/

a-host.yml
b-host.yml
c-host.yml
f/

d-host.yml