unbound-control to display trust anchors?

[Stephane Bortzmeyer via Unbound-users]

I'm compiling a list of commands to check the trust anchors of a
resolver (for the Day of Doom 11 october) like 'rndc managed-keys
status' for BIND.

With Unbound, the only solution I find is to cat the trust anchor
file, which is less convenient, since its location is
system-dependent.

Any way to do it with unbound-control? (I swear I've read the FM
before.)