External address ID

Questions
1

Are there any customData or other sutiable field (preferably displayed in backoffice) that one can use to store External Address ID on an address in litium 7?

We want to have customer addresses in litium to display in checkout but we only want to send a address Id to the ERP. Are there any prefered place or field on a n address to store av external ID?

Litium version: 7.2.0

2

Address has CustomData where you can store any object, hopefully you can use. But it is not visible in backoffice.