How to autofill custom field with widget api

I would like to ask for advice on a technical matter, and would appreciate your help if you have knowledge of it.
What we would like to do is here

When a customer makes an inquiry from a product, we would like to autofill the inquiry field with the account data of the customer who is logged in to the product at the same time he/she clicks on the inquiry widget.

- Name
- Email address
- Custom fields (company name and branch name)

I am able to take over the name and email address, but I am unable to take over the values of the custom fields.

I am using the widget api to autofill the name and email address in the following way.
 

zE(function() {
zE.identify({

email: 'john@example.com',.
});
 

I was also trying to autofill custom fields with custom field IDs as follows, but the situation is not working.

zE(function() {
zE.identify({
name: 'John Citizen',
email: 'john@example.com',.
'123123123123': 'Custom Fold 1'
});
 

I contacted customer support but did not get a good answer, so if you know of anyone who might be able to help me, I would be glad to hear from them.