group_vars all organisation

I use roles. In group_vars for a role I have for 3 files that contain variables and values:

esb
mq
httpd

Sometimes esb needs info that is in httpd. I would like an “all” file to include one or more files, rather merging 3 files into “all”, something like this:

$cat all

  • include: esb,mq,httpd

Is this possible, and how?

Thanks,
Jepper

the files are pure yaml and get sucked in by the yaml parser, yaml has no
way to include other files.