Possibly, but it depends on what you're after and the results may not be quite what you expect.
A quick look at the specs
here says it has some line outputs for direct injection into a PA system but what's not clear is how hot these are.
It's possible that they may provide enough signal level to drive a pair of higher impedance headphones directly but...a lot will depend on where those line outputs are in the circuit schematic as they may bypass significant parts of the circuitry.
Find the schematic and it would make it easier but you may find that it's a dry signal that's output to the line outs, ie no reverb/chorus and possibly no tone shaping and also the output may well be controlled by the master volume meaning that even though you've got headphones plugged in, the main speakers are still driven, which will defeat the whole idea.
You'll just have to try it to find out.
If the line levels are independent of the master out but not hot enough to drive headphones, you could instead connect a headphone or even a hifi amp amplifier to them to drive your headphones, but it seems a bit like overkill when you may as well get something like an old Korg Pandora that will be fine for practice and that will drive headphones with ease and if you instead want sublime quality, assuming you have a piezo pickup get a Fishman buffer or a Little Labs multi z instead to drive a hifi amp from your guitar or whatever. Not be cheap though...
I'm assuming this is because you want to retain the piezo & magnetic pickup combination of controls and tone shaping and effects this amp gives you?
Depending on how comfortable you are with a soldering iron, you could also simply try inserting a switching jack on the output panel that disconnects the internal loudspeakers and then provides a direct connection for headphones or via a headphone volume pot. I'd suggest putting a limiting fuse in the circuit for the headphones and also remember to keep the master volume turned right down.
The power amp part will likely be fine, I expect it's a pretty standard Mosfet design that are pretty forgiving and generally indestructable unless you go full on and directly short the outputs in which case it will probably just go into thermal overload shutdown mode and spring back into life after cooling back down but I'm not promising this, it's nothing to do with me if it goes horribly wrong...