What happened to CF_ZONE_ID in Wrangler 3?

I see with current Wrangler documentation a mention of 'Zone ID route' (https://developers.cloudflare.com/workers/wrangler/configuration/#zone-id-route) in the config file, but, for security reasons, we don't want the information stored in flat files in any case. I see here (https://developers.cloudflare.com/workers/wrangler/system-environment-variables/#supported-environment-variables) that dynamically defining CLOUDFLARE_ACCOUNT_ID & CLOUDFLARE_API_TOKEN appear to be the go-forward environment variables to use with wrangler deploy, but, I don't see in the documentation any mention of CF_ZONE_ID or a new CLOUDFLARE_ZONE_ID being supported. Is it? Or, is there some other thing that should be done instead? Please advise.
System Environment Variables are local environment variables that can change Wrangler’s behavior. There are three ways to set System Environment
Wrangler optionally uses a wrangler.toml configuration file to customize the development and publishing setup for a Worker.
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