Thank you very much for your response!
I would have put up with this answer, but when I took an arbitrary midi file from the Internet and opened it in Chordana play, the fingering appeared! (Screenshot)
At the same time, if the "song ransfer" works, then there is also a fingering on the synthesizer (I saw the video on YouTube).
Hence there is some way to convert a normal MIDI file to a casio file with a fingertip!