This app would be nice to add.
https://strlen.com/treesheets/
You are here
TreeSheet
October 13, 2021 - 2:55pm
#1
TreeSheet
October 23, 2021 - 12:28pm
#2
2 + 1
At least, you may try the already present ones: KeepNote & Cherrytree. There is also another one → https://treeline.bellz.org/