How about
| timechart span=1d sum(Cases) as Cases sum(Hospitalizations) as Hospitalizations sum(ICO) as ICO sum(Recoveries) as Recoveries sum(Deaths) as Deaths
However, there are 5 data elements above, but how many locations do you have and what granularity is _time in your source data, as sum() might not be the correct aggregation, e.g. if the value in your data reflects the latest value at that time, then max() would be correct.
but if you have a location split by then you will rapidly reach a number of series on the chart that will make it unreadable.
