Validation Validationsummary in a modal receive Json message

Question

My application has a View Create which is opened through a modal and the Controller which was a Actionresult became a Jsonresult then return Json after the request [Httppost].

The [Required] Field Dataannotations work perfectly.

Except that in this change some validations of my old configuration have not worked anymore, being it mandatory.

These messages were captured by:

@Html.ValidationSummary(true, "", new { @class = "text-danger" })

How do I get Validationsummary to capture the message that is sent via Json

Examples of the return sent by my Controller Create.

return Json(new { resultado = true, mensagem = "Cadastro realizado com sucesso!" });