Context sensitive child pages didn't work for me

I tried it and it didn’t work as it says.

I (and many other people out there) are looking for a WP plugin that:
– works in sidebars (Widget)
– dynamically lists child pages of the CURRENT page as an unordered list (ul li)
– does NOT show any parent pages, home page or totally unrelated subpages (child pages of other pages than the one currently opened)

We are not looking for another menu or sitemap. Complex websites containing hundreds of hierarchical pages require some sort of context sensitive submenu. If I open a page for a certain topic and the content is distributed onto several subpages (child pages) of that topic page, I want to have a sidebar menu (link list) showing me all available child pages, but no other pages (I already have a full menu in my site).

Probably this is difficult with WP, I don’t know, I am no programmer. But I see that many people ask for exactly this solution and no plugin so far does exactly what they ask for.

PARENT A
CHILD 1
CHILD 2
CHILD 3
PARENT B
CHILD I
CHILD II
CHILD III
PARENT C
CHILD a
CHILD b
CHILD c

Example: I open PARENT B. I expect the sidebar widget to list this:

PARENT B
CHILD I
CHILD II
CHILD III

(Listing the PARENT B here is optional, I am already on PARENT B, no need to show this as a link again).

There is absolutely no need to show PARENT A or PARENT C or the CHILDREN 1-3 and a-c pages here!

I just wonder why most plugin authors say: this can be done with my plugin, when actually it can’t be done and the widgets list a full sitemap.

Manually including/excluding won’t work on a sidebar widget that has to show context sensitive lists. We are not using this as a static menu (WP already has all components for doing that).

Correct me if I am wrong and please show me a way to do what I described here without programming. The solutions offered here already just didn’t do the trick: I always end up with a full page listing.

https://www.ads-software.com/plugins/hierarchical-pages/