NOC Letter Format to be acquired from Last employer; Poland's D type visa query

Hi,

I'm from Pakistan. I need to apply for a national visa D type as i have received a job offer from an IT firm in Poland. Along with required documents one is NOC letter from last employer in Pakistan. Can anyone here please help me with this and tell what should this letter contain on it ?? Or what is the format of this letter?

Thanks

@khan001

Here are some examples: documentshub.com/certificates/noc-format/