Sorry, the last post I’ve made has been closed, but I’ve just come across the following links which seems to make referrence that it is indeed possible for browsers to make use of MacOS password autofill.
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https://bugs.chromium.org/p/chromium/issues/detail?id=1170065#c14
I find this such a core feature. I generally don’t believe in or trust the idea of a browser securing passwords, or even managing bookmarks. These are features that should be added by add-ons as the OS is a more secure method for password storing and people use bookmark tools in different ways (and nice not to have it locked to one browser).
Regards