I don't think that's really going to increase oxygen levels much but may help a little, you're just pumping new water in.
What you need to do is spray water up into the air that is fed by the pond water.
Take that sprinkler system that's there, route the inlet pipe to the bottom of the pond, and use a pump to make it operate so it draws the water from the pond and not the well.
It's hard to get oxygen to the lower levels of the pond, because oxygen rises, that's why having the water inlet draw from the bottom of the pond works best, it takes that lower level water and adds oxygen when it's sprayed above the surface.