join value FormData with axios use javascript

i send value using postman with body form data format like this :

example with postman

analisa_type:1;1;2
eficiency_type:0;1;1

I input array data with separator (;)

i am confused how to separate it on axios
this is my code

let eficiency_name = this.items_efiicieny.map(x => x.analisa_exception_label).join(";");
let eficiency_type = this.combine.map(x => x.object_type).join(";");

const f = new FormData();
f.append("analisa_type", eficiency_name);
f.append("label_type", eficiency_type);

how to format the form data so that the value is like in postman?