@Nidhi Priya, Thanks for posting in Q&A.
Based on my research, there is no such feature in Intune can export LOB application package, however, you can use the method mentioned in the following link to trace the installation package on the old tenant.
https://www.reddit.com/r/Intune/comments/v3uc5a/retrieve_uploaded_msi_application/
https://oliverkieselbach.com/2019/01/03/how-to-decode-intune-win32-app-packages/
https://call4cloud.nl/2022/03/honest-win32app-thief/
Non-official, just for reference.
Or you can re-download the application package from the Internet and convert it into LOB format and upload it to the new tenant
Hope it will help.
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