Read the EHAS site and contact them if you have further questions. There is a particular paragraph that seems to address this. Do NOT falsify your document like a previous poster suggested.
EHAS LINKBelow is just part of what is stated but it seems to apply in your case.
From the EHAS site:
4. You are considered fully vaccinated with an accepted vaccine:
2 weeks after a single-dose of vaccine after a confirmed COVID-19 infection within 6 months before the vaccination (to be stated on proof of vaccination in absence of a digital COVID-19 infection certificate).
