How can I view the text content of a file with an unknown or unsupported extension in the Files app with iOS?

I'm using the Files app on iPhone to browse code files I store on iCloud Drive. But when I try to open files with unknown extensions (e.g. .qml, .xyz, .abc,...), I can't view their text content. Is there a way to preview or open any file as plain text on iOS, regardless of extension ?