Which Model works better for Data Extraction for Purchase Orders

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Hi  All,
We have recently tried the Azure AI Document Intelligence services as part of the new Azure AI Services. The service has been working great for Service Orders and we have made some customizations to adjust the extraction according to our business needs. We are now planning to extract data from Purchase Orders. However, as each vendor has their own format, it may be challenging to train the model to extract generic content such as "Ship To" and "Bill To" or "Deliver To" and "Invoice To" for each and every PO format we have. Would appreciate your suggestions on the best approach to achieve these dynamic scenarios.