Get custom checkout field value and add it to the customer's address

Hello,

I have added a custom “house number” field next to the street address field in the checkout. Everything works and its value is being saved to the local storage. Is there any way i can get that value and add it to the saved customer’s address in their profile?

I’m using this code currently (which is working for the order confirmation email):

{% if attributes.houseNumber != "" %}{{ attributes.houseNumber }}{% endif %}

.. but it’s not working.

Any ideas?