If a Chinese supplier gets the FDA EUA, then its KN95 could be imported and used in USA Healcare sections.
How to know if the Chinese supplier has got the FDA EUA?
Click "Personal Protective Equipment EUAs", see image below.
Find "Non-NIOSH-Approved Disposable Filtering Facepiece Respirators Manufactured in China", and click and download the "Appendix A". See image below.
All the Chinese suppliers who got the FDA EUA are listed on this appendix.