i am using strapi 4.15 and below code works for me and even if we mention filed name in path key it also highlight field in admin ui form
const { errors } = require("@strapi/utils");
const { ApplicationError } = errors;
throw new ApplicationError("Title already exist", {
errors: [
{
path: ["title"],
message: "This attribute must be unique",
name: "ValidationError",
},
],
});