With regards to your concern to get data from Pmax campaigns on a Item ID, you may use the shopping_performance_view to retrieve metrics summarized by product segments such as segments.product_item_id.
SELECT
segments.product_item_id,
metrics.all_conversions,
campaign.advertising_channel_type
FROM shopping_performance_view
WHERE
campaign.advertising_channel_type = 'PERFORMANCE_MAX'
Let me know if you have any questions.
Thanks,
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