How to report CPF Central provident fund from Singapore (foreign pension plan)

I have a Central provident fund from Singapore (foreign pension plan) 20 years ago. I didn't remember the contribution amount and it grew to $xK in last year. The Central provident fund requested me to withdraw the whole amount due to I didn't work in Singapore nor live at Singapore anymore.

May I know how do I enter the $xK in the following boxes, and I also don't remember the contribution.

 

 

 

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