@Sravan Vemishetti Form recognizer 2.1-preview version allows you to recognize check boxes in a form. The content in your form can be extracted as a key value or a labeled pair based on the training of your custom model. You will need to use the form recognizer labeling tool with 2.1-preview version of the API to train different files of a similar template and then create a model. Once all the required templates are trained with their custom models you can compose them into one single model i.e this new model will include training of all the previous models with a new model id. This enables you to use one single composed model to recognize documents of different templates which were part of your training.
All the steps mentioned above are document in this quickstart which can help you get started. I hope this helps.