Hello ankitsjain,
After reviewing this, we believe that there isn't a supported way to transfer synced content from the TV app on your iPhone to a computer, but we'll do our best to help out.
In the TV app > Library see if you can tap and hold on the content you wish to get to the computer. If you have options to share this content, you can email or share it in another fashion to your computer.
However, there isn't a supported way to sync back this content, since it was originally synced from another computer. We know this isn't what you were hoping to hear, but know it is the correct answer given the situation.
Hoping this helps, take care.