1.12 NPCs able to join player party. How do we test this? Is there a demo?

Patch notes for new added features in Flare 1.12:
"Added the ability for NPCs to join the player’s party. (Igor Paliychuk)"

https://flarerpg.org/2021/08/02/flare-1-12/

I want to better understand how this is set up and what event commands are used and the general parameters to implement this and to what are the limitations and strengths of this feature. This is a major gameplay feature and it hearkens to Diablo 2 or even possibly Baldur's Gate and Dungeons and Dragons in nature.

Where do we find a guide for this?
Where do I find more information on this?
Here? https://github.com/flareteam/flare-engine + https://github.com/igorko

Somewhere in here? https://github.com/flareteam + https://github.com/flareteam/flare-engine/blob/master/docs/attribute-ref... ?

It seems like this was just ninja'd into the features without much more detail put into the explanation. Do I have to do a rerun of the Flare Game campaign to find a recruit-able NPC and then reverse engineer that map for guesses? Is this feature even implemented in the Flare game campaign in the new 1.12 version?

I cannot find anything related with "NPC" search to do with the ability for NPCs to join the player's party here: https://github.com/flareteam/flare-engine/wiki/Attribute-Reference yet it was last edited July 2nd so it seems to predate the August 2nd release of Flare engine 1.12; yet this could be messy given that candid 1 of 1.12 released on day after on July 3rd 2021.

How do people make use and test / understand the parameters of:
"Added the ability for NPCs to join the player’s party. (Igor Paliychuk)"?
Is there a demo and or guide for people to use and reverse engineer and better test and understand that monumental gameplay feature?