Letter of appreciation PR examples

I am currently applying for Permanent Residence through the 10-year route and am looking for examples of Letters of appreciation. I find tons of examples of statements of reason that the applicant has to write but no success on finding examples of recommendation letters that others (boss friends spouse etc) write for you.

I do see some points/website that wrote what needs to be in there, but no actual written letters. of course i know that these should be unique but better to be written with some examples at least

any help with example letters would be great.