You can use Form Recognizer along with OCR Labeling Tool to train a custom model with table data. Please refer to the following document for more details. Table data should be detected automatically and will be available in the final output JSON file. If the model fails to detect all of your table data, you can manually add tags (refer to the Tip section). Hope this helps. Thanks.
https://learn.microsoft.com/en-us/azure/cognitive-services/form-recognizer/quickstarts/label-tool
Source: Azure Docs