How/where to set samesite cookie value?

Hi there, I'm trying to change the value of this cookie MB_SESSION_COOKIE_SAMESITE on our cloud instance (pro-plan) but unfortunately I had little idea on where to do so. I tried using the api, particularly this end-point PUT api/setting but the serves complains the key doesn't exists, and I see no way of creating it.

Any suggestions? thank you

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