Configuring contextual filters

Hello,

First of all, this is a great module.

I'm facing an issue with contextual filters : I would like to use the nid from URL as a contextual filter. It seems so easy but I'm obviously missing something.

In the example view / Example 3, how would I dynamically replace the Apath value nid=2/related with something like nid=%/related, % being the current node id ?

At this point I have a test block that calls https://gist.githubusercontent.com/glitchedmob/373e1ebf69d2c90cbf1a98322...
In the request parameters, Apath value is %.char_id
It can successfully filter the view with a JSON field > field key : char_id but same problem here : how can I replace this value with the node id of current page ?

Any help would be much appreciated !