In case you need local https support, and no other ways to config chrome.

Maybe you can use caddy as reverse proxy for phoenix.

Caddyfile:

	https://localhost:5000 {
		reverse_proxy 127.0.0.1:4000
	}

Next: install caddy self-signed cert file on your OS.

location of self-signed cert file:

$HOME/.local/share/caddy (For Unix/Linux/macOS)