Putting a "Fill In" area inside of a Paragraph

Hello! I am sure there is a super easy way to do this that I'm just not realizing..

So I am writing a contract and I'm wanting to leave spaces for different dollar amounts to be filled in, but I would love to be able to have these be "fill in" boxes within the paragraph instead of just blank spaces.

Examples: Client will pay $[insert fill in box or number selecter] on [insert fill in box] 

I just can't seem to figure out how to add that INSIDE of a paragraph.

Hello aeroberts,

You may like to take a look at our "Narrative Fields" widgets. This will allow your users to be able to input values within the narration of your form. 

Hope this helps.

Do get back to us if you have any questions.

Thank you!