2022.07.07: new type of Custom Field is introduced by Brian Teeman after a post I made on the Joomla Facebook Group, namely a CF of Type "List of Menu Items". See example with the button below.
Suppose you have a Blog View... but when clicking on one of the post you don't want to open the corresponding article... but another Blog View. With other words, you want "nested Blog Views" (ie a kind of "Matryoshka").
See https://github.com/joomla/joomla-cms/pull/38244 for all details