Digital Output as an interrupt Source?
Is there a way that I can use this to use digital output as an interrupt source?

Not as long as it's configured as output, in any case.
But, on most modern microcontrollers, you can configure any pin to be input or output (but obviously not at the same time).
If the interrupt controller allows that, you can then use that input as an interrupt source.
Whether it does that is said in programming guide / user manual of the microcontroller on that board. You'll need to find that guide, and look for the interrupt controller description. It's probably possible.