The government should recognise people who test positive for antibodies or a T-cell response to Covid-19 in the Covid pass, in addition to being vaccinated, having a recent negative test, or having had a positive PCR test in the past 180 days.
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The purpose of the Covid Passport which may be mandated to be required in some settings is to prevent the spread of Covid.
The priming of the immune system can be via vaccination or recent infection. Many people will not have had a positive PCR test to prove previous infection, so blood tests for antibodies or T cell response should also be accepted for the Covid Passport.
This is just one source about the immune response to Covid-19 infection: https://www.science.org/doi/10.1126/science.abf4063