Ember JS: Passing parameters to Model.save() for custom API

I'm working on an Ember.js application using Ember Data on a somewhat unusual JSON API.

To query an item from that API the URL looks like /singleitem?collection_id=1&item_id=2 To fetch the data I'm using this model hook:

import Route from '@ember/routing/route';
export default Route.extend({
    model(params) {
        return this.store.query('singleitem', {item:params.item_id, collection:params.collection_id});
    }
});

In a component I show data from the API in an <input type="text"> field and when the user changes the content I want the component to update my model and write it back to my API:

import Component from '@ember/component';
export default Component.extend({
    async change() {
        this.test.set('title', 'Hello World!');
        await this.test.save();
    }
});

This code sends a PATCH request to /singleitem/2 where 2 is the 'id' property from the response of the JSON API item.

How can I pass parameters to save() so that the PATCH request is sent to /singleitem?collection_id=1&item_id=2 – just like I've been able to do in this.store.query?