JSON payload with diacritics for HTTPRequest

Questions
,
1

Working in the creations of APIs with Mathematica 12.2, I got this problem with diacritics when sending JSON data.

Here is a toy code using httpbin.

HTTPRequest["https://httpbin.org/anything",
      <|
      Method->"POST"
      ,"Body" -> (<|"textWithDiacritics"-> "àéíóú"|>//ExportString[#, "RawJSON"]&)
        |>
     ]//URLRead[#, "BodyBytes"]&//FromCharacterCode//ImportString[#, "RawJSON"]&

AZef6.png
AZef6.png1638×336 59.8 KB

I found this related post, It seams to be a bug in ExportString for RawJSON.

Any suggestions on how to get around this case?

Cross post in Stack Exchange.