Software idea: A text software that lets you fold based on tab indentation, and define arbitrary text as headers tags and also define their format.

Example of the text describing the configurations that would be used (format wouldn't be inline oc but just in case any of you complains):

# Header, blue, slightly bigger text, bold
item 1
item 2
! red line of text, indicating to-do or current state
arbitrarily
indented
foldable
text

Now the rant: I can't find any software that offers this. :/ I have to define a whole language spec to do this in the editors I've checked.
If you happen to think about some editor, tell me.
Of course, I could code it myself, but I'm married to University for now.