Is it possible to add inline custom fields in sales invoices to custom reports
Why don’t you just try it and tell us? 
Or you could search the forum for previous answers to the same question.
This looks very similar to the question you already posted in December.
restdev Dec '21
Hi
Is it possible to add the sales in-line custom fields to the custom reports?
I notice that the customer balance does show 0 in the custom field “Customer Balance”
I am closing this topic.