Version 0.2 of package Hl-Block-Mode has just been released in NonGNU ELPA. You can now find it in M-x list-packages RET.
Hl-Block-Mode describes itself as: ========================== Highlighting nested blocks ========================== More at https://elpa.nongnu.org/nongnu/hl-block-mode.html ## Summary: Highlight blocks surrounding the cursor. ## Recent NEWS: [Not provided 🙁]