Creating Shortcut sequence with numbers -QML

[Sandhiya]

I want to have a shortcut sequence which includes numbers.
For eg.
Shortcut {
sequence: "Ctrl+Alt+Tab"
onActivated: {
console.log("sequence pressed")
}

instead of "Ctrl+Alt+Tab" ,I need to have 2,1,5 as the shortcut sequence.
When i tried to give one number as sequence, it 's working.
Shortcut {
sequence: "1"
}

Similarly when I tried for more than one numbers , it's not working
Shortcut {
sequence: "1+2+3"
}
(or)
Shortcut {
sequence: "1,2,3"
}