Import from WLP API

I am trying to create a unit by importing the WLP file via API (or assign the WLP settings to an existing unit)

I am trying to replicate this via postman but it is not entirely clear to me how I can assign these wlp settings to a unit. Where do I assign the unit id?

I am following the documentation in https://sdk.wialon.com/wiki/en/sidebar/ … mport_json
I made a post request to the endpoint svc=exchange/import_json&params={}
I uploaded an image of my form_data to the attachments. I receive back a status 200 with an empty object {}

This API request is not entirely clear to me. How shall I go about this?

Thanks.