In conclusion, its not particularly hard to find this data with a few searches on your favourite search engine.
0. https://www.abs.gov.au/articles/covid-19-mortality-1 1. https://bmcmedresmethodol.biomedcentral.com/articles/10.1186...
In the data you linked to, the age group 0-59 15 people died, lets say the 74% number which is from all ages, that makes 4 where healthy.
If you want to answer this question for your country look at the official government numbers, I assume the CDC has those numbers for the US, the RKI publishes these numbers for Germany, etc. A generic Google search will find the most attention seeking site claiming stuff mildly related to your question.
Below 40, the official stats say 43 males have died of which are 6 boys below 19 years old. The population is about 10 million. What if those dead had underlying genetic diseases or diabetes or hypertension?
Fully a third of Americans are obese, for instance. And why is 40 the cutoff anyway? That's half the population right there. So already you've excluded two thirds of Americans, right from the get-go.
And what percentage of "underlying health issues" are undiagnosed and asymptomatic until a severe challenge comes along - like a heart murmur? It's all very well saying "well I don't have any underlying conditions", but do you really know that?
That is 33-100 micromorts. You can use this unit to compare with other activities (higher value is more lethal).
Base jumping is 400 micromorts.
Seriously asking, its like the modern web has thrown such a question into a kakfaesque hole.