macos – How can I show hidden files on ‘choose a file’ dialog in 3rd-party apps?

I want to choose a file under hidden directories on any application but Finder, but it seems to be not shown. For example, if I put a file called my.terminal under ~/Dropbox/.hidden/, and try to choose the file on Terminal (Preferences -> Profiles -> Import), I could not reach the file because it is, I think, put under a hidden directory. The file is not searchable on the search box.

In this case, I first have to copy the file to other directories that are non-visible, and then choose the file again. This is quite painstaking and I want to avoid it, but is this possible on macOS (Big Sur)?

I already set the Finder such that it shows hidden files, but this has no effect on other applications.