One caveat is that you have an i-phone. Don't know how good it is but as it costs nothing and you have an i-phone then nothing to lose trying it.
https://www.msfsaddons.org/freeware/iphone-trackir
Regards
Nigel.
Alternative Free Eye Tracker for MS2020
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Alternative Free Eye Tracker for MS2020
I used to be an optimist but with age I am now a grumpy old pessimist.