How to send a file along with other data?

Question

Vue.js

There are 2 objects.

project {name, description}
file

i need to embed the file in the project structure so that the request looks like this

{
name,
description,
file {}
}

Those. the file is embedded in project.
I'm writing the wrong code at the moment

let project = new FormData();
project.append(this.project);
project.append("file", this.file)

I post it in such a way that the direction of thoughts is clear. Wrong because I need to specify two values, but I don't want to put the project in a separate object. How to fix the code to get the desired structure of the request? Back Laravel, the file must be received as a file