Does Focus Keyword Matter for SEO?

I’m really sorry as this might sound like a dumb question but I can’t seem to find a definitive answer on this topic. My question is this, does the focus keyword matter inside the Yoast SEO plugin matter for SEO purposes or just internally for the purpose of analyzing whether your post is optimized for a certain keyword? I’ve checked the page source for pages that I do set the focus keyword and pages where I don’t set the focus keyword and my ‘focus keyword’ that I enter into the ‘focus keyword’ field of the plugin isn’t outputting in the page source. I know the ‘seo title’ and ‘meta description’ fields are important and what they do but does the ‘focus keyword’ field actually mean anything to Google or is it just for use in the plugin to tell you or not if you’re post or page is optimized?

In other words does the ‘focus keyword’ field actually hold any weight with Google themselves or is it just used for the internal purpose of the plugin to analyze whether you’re post or page is optimized or not (i.e. so the green light comes on)? Sorry if this is a dumb question but I can’t seem to find a definitive answer ??