How Do I Get More Security for Keychain?

I’m a Patreon supporter and love what you do for us.
I have a security question related to Keychain. I get into Keychain on the Mac or the iPhone either using Face ID or the passcode for getting into the device. Which means that the security of my passwords in Keychain are only as strong as the passcode I’m using to unlock the Mac or the phone.
Is there a way to add a separate password to access Keychain which is different from the device passcode, to act as an additional security barrier?
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David