Foreign Pension Disclosure

I will start receiving a pension next year from a company that I worked for in the UK over 20 years ago.  I didn't even know I was eligible until a few weeks ago when I got a letter from them notifying me of such.  It's not a pension I contributed to, it's a defined benefit plan.  My questions are:

 

1. Do I need to disclose this pension on a form 3520 or 8938?  I'm not familiar with these forms or how a defined benefit plan works. 

2. How do I determine a value for the pension when if I'm not receiving benefits yet and have no account statement to make a determination.

 

Thank you