key-value field with nested json array

hi everyone ,
i have application i want to migrate the database of it to filamintphp ,
one of the coulmn is a settings coulmn with json multi-level array
when i use KeyValue input field the sub arrays shown as [object Object]
how i can convert these also into key values inputs?
field example:
{
'key1':'value',
'enabled_notifications':{
'key1':'value'
}
}