Is it possible to add a custom field to a customer account statement?

Hi nemo-lenses-gmai,

I'm here to share some information about creating statements.

Currently, we can add a custom field on the sales forms like Invoice, Quote, and Sales receipt. 

As for the customer statement, you can only customise it to show either List each transaction as a single line or List each transaction including all detail lines.

I've added this reference for the detailed information about customising statements: Customise your statements.

I'll be around whenever you need help.