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$document = \Bitrix\DocumentGenerator\Document::createByTemplate($template, $dealId);

$arTest = [
    'MyField' => 'test from index.php',
];
$arTest2 = [
    // 'Table' => new DataProvider\ArrayDataProvider(
    'Test' => new DataProvider\ArrayDataProvider(
        [
            [     
                'Id' => 345,
                'Name' => 'Item name 1',
            ],
            [
                'Id' => 346,
                'Name' => 'Item name 2',
            ],
        ],
        [
            'ITEM_NAME' => 'Item',
            'ITEM_PROVIDER' => DataProvider\HashDataProvider::class
        ]
    ),
    'TestItemId' => 'Test.Item.Id',
    'TestItemName' => 'Test.Item.Name',
    'TestIndex' => 'Test.INDEX',
];
$arTest3 = [
    'Table' => new DataProvider\ArrayDataProvider(
        [
            [
                'Name' => 'Item name 1',
                'Price' => '$111.23',
                // 'Image' => __DIR__.'/upload/image.jpeg',
            ],
            [
                'Name' => 'Item name 2',
                'Price' => '$222.34',
                // 'Image' => null,
            ]
        ],
        [
            'ITEM_NAME' => 'Item',
            'ITEM_PROVIDER' => DataProvider\HashDataProvider::class,
        ]
    ),
    'TableItemName' => 'Table.Item.Name',
    // 'TableItemImage' => 'Table.Item.Image',
    'TableItemPrice' => 'Table.Item.Price',
    'TableIndex' => 'Table.INDEX',
];
// $document->setValues(array_merge($arProgrammsData, $arTest));
$document->setValues(array_merge($arTest, $arTest2, $arTest3));