Consider a multi-line string in a .dart file:

final bigString = '''
I am a multiline string.
I might be really long.
For example, I could be an entire Android manifest (the XML you would find in an AndroidManifest.xml file)
that's defined in a test file.
'''

It would be nice if I could fold this. This is something I can do with multi-line string literals in JS/TS:

Describe alternatives you've considered
The user can manually create folding regions using the "Create Folding Range from Selection", but it's generally not worth the time to do this.