Magento 2.2 - How to remove product Meta Keywords maxlength validation from backend?

Question

I want to remove validation for product meta_keyword from backend or else to increase the length of the product meta_keyword.

I also tried to remove maxlength validation from vendor/magento/module-ui/view/base/web/templates/form/element/input.html file.

I check in the database for meta_keyword and DB allow to add more value for it but Magento 2 prevent it to add only 255 length in product meta_keyword.

Does anyone have any idea about this?