expandable form fields

Anyone know of a way to insert an addressee name in to a paragraph of introductory text?
As names are of varying lengths it would need to be an expandable field that causes the text on either side to re-flow of course.

Not sure if it can be done in Adobe Acrobat Pro DC but it seems like it should be a fairly simple task, considering all the other fancy things it can do.

Here's an example of what I'd like to achieve in my PDF form:

"Dear [SALUTATION], welcome to our customer base..."

Where SALUTATION is a form field.