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The part of the sentence “haven't known” is correct and usable in written English.
It is an abbreviation of the words “have not known”, and is used in present perfect tense. Example: I haven't known the answer to this question.
Exact(59)
We haven't known for 20 years.
"What we haven't known is that it's never too late".
"I haven't known many geniuses in my life.
For 27 odd years I haven't known who I am.
The courts simply haven't known how to do it.
"For so long I haven't known anything," Mr. Penny said.
He points out that "younger Colombians haven't known a single day of peace".
And that will be really exciting, because for a long time we really haven't known.
"I haven't known it as bad as this for many years," he complains.
"I haven't known the day of the week my entire life".
I haven't known Hunter that long; I'm the newcomer for sure.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com