Yii2 Multi DataProvider

adicione
"karataserkan/yii2-multi-dataprovider": "*"
à requireseção de seu composer.jsonarquivo.

use karataserkanyii2MultiDataProviderMultiDataProvider;

$data1 = new ActiveDataProvider([
    'query' => $query,
]);

$data2 = new ArrayDataProvider([
    'allModels' => [...],
]);

$dataProvider = new MultiDataProvider([
    'dataProviders' => [$data1,$data2],
]);