[CURRENT] unbound: zonefiles?

I try my first steps with "unbound" on most recent current and snealing
through the web I find interesting things and howto's. But I realise if
I'd like to replace my office's DNS server (based on BIND as it was
part of the FreeBSD world) I run into a serious problem regarding the
zone- and authorative files keeping all the PTR and A records. As I can
see in the unbound.conf, the statements of those files (address to name
resolution, name to address resolution) is now somehow hard coded into
unbound.conf via those appropriate config tags like local-zone and
local-data. Since I have some larger files defining a local domain,
I'd expect having a data file to be loaded.

Maybe I'm wrong, eventually someone can send me short notice whether
external file load is possible or not.

Thanks in advance,
Oliver