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Whatever you try, I would first give the offending item a few sharp taps with a hammer, along the axis of the thread.
This will often jar any corrosion in the threads and generally loosen things a tad.
And its not as if you want to re-use the "nipple" .. which is actually a banjo bolt.
But I assume you've just removed that bleed nipple from it .. and I assume it was fitted as an aftermarket aid to brake bleeding.
If you have a vice, I'd hold the caliper in that, by the normal mount lugs but with wooden pads to prevent damage.
Then I might try an open ended spanner on it but my main guns would be a small "Stillson" type pipe wrench .. the sort with just one handle ... that self-tightens as you apply the welly.
Or else some Mole grips, but they can slip more easily.
I suspect you don't have a vice handy though ....?
If you don't have a vice you could always try clamping it to the edge of a bench or something.
If you have any clamps.
But it could all go wrong if the clamps slip.
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