I’ve found some information on existing checkmk forums from the past regarding this requirement, but not with some final solution.
Actually I’ve also such requirement how to push just specific host tag value (just one value, not all the tags) on mail notification.
For now I tried some several things, but for now no luck.
The closest solution was to define custom Host attribute, but there was a problem becase it’s not possible to use some predefined values like it is possible with tags.
Thanks in advance.