How do find the range of the number of files in a subfolder?

[Debugger]

How do find the range of the number of files in a subfolder?

Example: 400 to 600

[void]

For files only:
childfilecount:400..600

For files or subfolders:
childcount:400..600

[Debugger]

For files only:
childfilecount:400..600

For files or subfolders:
childcount:400..600

The option is not useful, because I found out that a tool such as Everything does not show the number of files, so it is still a big inconvenience.