Nice initiative but you'll struggle to publish the app on the app store and Google play(mildly put) with all their restrictions in relation to COVID19.
I am in fact with Google and Apple on this one - just don't. There's way too much misinformation and speculation already. Not necessarily a result of malintent, just the way sensations work these days as a result of the cattle mentality demonstrated by the masses I'm afraid.
For many years I've been strongly opposing the so-called "wisdom of the masses".
Maybe a web-based PWA while we wait for approval.
And not specifically calling it a COVID-19 app.