luci/applications/luci-app-radicale2/root/usr/share/rpcd/acl.d/luci-app-radicale2.json

{
	"luci-app-radicale2": {
		"description": "Grant UCI access for luci-app-radicale2",
		"read": {
			"uci": [ "radicale2" ]
		},
		"write": {
			"uci": [ "radicale2" ]
		}
	}
}