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Hello,

Please note that each chart type support only specific positions.

If you open MS Word and create a line chart, you can check the available positions for this chart type are the following: center, left, right, above (top), below (bottom).

Column chart supports the following positions: center, insideEnd, insideBase and outsideEnd.

Unfortunately, MS Word doesn't support all positions types for all chart types (https://c-rex.net/samples/ooxml/e1/Part4/OOXML_P4_DOCX_ST_DLblPos_topic_ID0EJ3QRB.html#topic_ID0EJ3QRB). And the bestFit value is not supported in most cases (and may generate a corrupted document).

For your task, maybe the best approach is adding a supported position for each series (mixing them):

'theme' => array(
    'serDataLabels' => array(
        array(
            'showValue' => 1,
            'formatCode' => '#,##0.00',
            'position' => 'top',
        ),
        array(
            'showValue' => 1,
            'formatCode' => '##,##0.000',
            'position' => 'bottom',
        ),
        array(
            'showValue' => 1,
            'formatCode' => '#,##0.0000',
            'position' => 'right',
        ),
    ),
),

Regards.