Entangle nested property value with livewire's alpine js until first property is not defined - laravel-livewire

Question

I am trying to get and set datepicker date via livewire and alpine js entangle solution. So when one is updated the other one has been set automatically but I am facing some issues when entangled property is nested one.
The main goal here is to update the bootstrap datepicker component when b2c.birth_date is updated and vice versa, however when page is first loaded and when b2c is not defined yet and it throws this error until b2c itself is not defined.
Alpine js Expression error: Can't get birth_date of null
In below code I have added js condition but this is not proper solution I believe as currentDate in this case is not updated after b2c is defined.
<div id="birthdatepicker-container" class="input-group"
x-data="{currentDate: $wire.get('b2c') ? #entangle('b2c.birth_date') : ''}" x-init="$($refs.input).bootstrapDP('setDate',currentDate)"
>
<span class="input-group-text"><i class="fas fa-calendar-alt"></i></span>
<input wire:ignore id="b2c_birth_date" x-ref="input" class="form-control" type="text"
x-data="{
init() {
$($el).bootstrapDP({
}).on('changeDate',function(e){
$wire.set('b2c.birth_date',e.format());
});
},
}" />
</div>
Please suggest some kind of promise like async thing to update currentDate when b2c.birth_date is defined entirely (anytime via network request. sooner or earlier). Same like how it works nicely when we write wire:model="b2c.birth_date"