How do I handle a . in a field name?

[ShtibsDev]

I am creating a dynamic form builder.
One of the requirements is to have a Map like field with string as the key.
Because it's totally dynamic and the nature of the lib, keys that contain the . character, are messing the structure.

For example:
When trying to edit the key '10.03.2024 Test', instead of the expected

{
	mapLikeField: {
		'some Key':  {/* some obj value*/},
		'someOtherKey': {/* some obj value*/},
		'10.03.2024 Test': {/* some obj value*/}
	}
}

the first number in ts key string transforms the value into an array... Something like that:

{
	'mapLikeField': [
		undefined,
		undefined,
		undefined,
		undefined,
		undefined,
		undefined,
		undefined,
		undefined,
		undefined,
		'03.2024 Test': {/* some obj value*/}
	]
}

Any ideas?