How to set SameSite cookie for YouTube in Laravel 5.8

I load YouTube videos in iframes on my website using Laravel 5.8.17. Peeking in the console I'm getting this warning:

A cookie associated with a cross-site resource at http://youtube.com/ was set without the SameSite attribute. A future release of Chrome will only deliver cookies with cross-site requests if they are set with SameSite=None and Secure. You can review cookies in developer tools under Application>Storage>Cookies and see more details at https://www.chromestatus.com/feature/5088147346030592 and https://www.chromestatus.com/feature/5633521622188032.

I set my 'samesite' session.php to this now:

'same_site' => "lax", // was null before

But I'm still getting the warnings. How do I fix this properly?

via Chebli Mohamed