Dynamic Date in Web Query

I am trying to do a POST request using the blank query editior. I need to include a body query within the source to specify the date in yyyy-mm-dd format. If I manually type the date i.e. 2022-05-22 then my query pulls data from the site. However, I am trying to make the query reference today's date, so that at any point in time I am referencing the latest data. Unfortunately the date is required in the body for this provider.

I am struggling to pull today's date, in the format, and pass it through to my URL. Below is the working query, where I specifiy the date manually. How do I make that date always be todays date?

let

body = "{""Dates"":""2022-05-22""}",
Source = Json.Document(Web.Contents("https://app.officevibe.com/api/v2/engagement", [Headers=[Authorization="Bearer fakeapikey123423424242424", #"Content-Type"="application/json"], Content = Text.ToBinary(body)]))
in
Source