you really have to work at it but it’s possible:
- create a flow that adds a tag (i also added as meta field for API use)
- add liquid code to process it to a customer web-event in liquid
- use custom web-event in web-pixel
analytics.subscribe("gtm_extras", (event) => { event.customData.customer_create_date }
note: only on front-end of site, but most customers will come back there or use on future visits
note: this wont be available though checkout - if you want that you’ll have to store in the session as well