Example of importing data with cloud functions. See a live example at https://www.back4app.com/database/davimacedo/parse-import-example

curl.sh

curl -X POST \
-H "X-Parse-Application-Id: LL9oIdzIkmwl5xyowQQu0fTmXyUWfet9RuAzwHfj" \
-H "X-Parse-REST-API-Key: R3S8PYQKuzeV4c8MUeO5ved46C50MEp56boDHW1O" \
-H "Content-Type: application/json" \
-d @data.json \
https://parseapi.back4app.com/functions/import

data.json

{
	"className": "ExampleClass",
	"rows": [
		{ "ExampleColumnA": "row1columnA", "ExampleColumnB": "row1columnB" },
		{ "ExampleColumnA": "row2columnA", "ExampleColumnB": "row2columnB"}
	]
}

main.js

Parse.Cloud.define('import', async request => {
  const className = request.params.className;
  const rows = request.params.rows;

  const MyClass = Parse.Object.extend(className);

  var myClassObjects = [];
  for (let i = 0; i < rows.length; i++) {
    const myClassObject = new MyClass();

    for (const column in rows[i]) {
      myClassObject.set(column, rows[i][column]);
    }

    myClassObjects.push(myClassObject);
  }

  try {
    await Parse.Object.saveAll(myClassObjects);
  } catch (e) {
    throw new Error(`Import failed: ${e}`);
  }
  
  return `Successfully imported ${myClassObjects.length} rows into ${className} class`;
});

Thanks for the heads up. I've just updated the live example code.