@Salik Rafiq Thanks for the question. Can you please add more details that has been extracted from the custom model form recognizer.
As a workaround until then you can try and use the Form Recognizer train with labels feature and label these tables as key value pairs, labeling each cell of the table as a value. Please note you will need to label and train with 5 samples with the maximum number of rows in the tables. Let me know if this helps.
Please follow the document to Train a custom model using the sample labeling tool.