It works. Amazing!!
{
"context" : "kEngraveMode",
"shortcuts" : [
{
"EventEdit.Nudge?Direction=Left&Amount=kALot": [ "F1"]
},
{
"EventEdit.Nudge?Direction=Left&Amount=kALittle": [ "F2"]
},
{
"EventEdit.Nudge?Direction=Right&Amount=kALittle": [ "F3"]
},
{
"EventEdit.Nudge?Direction=Right&Amount=kALot": [ "F4"]
}
]
},