Not really. The official report used the numbers self reported by the USSR (not known for its bureaucratic honesty) and TORCH (The Other Report on CHernobyl) was funded by the environmental movement. So we can lower bound the deaths by 4,000 and upper bound them by 1,000,000, but after that you are on your own.

I did my own looking and came to the conclusions that "deaths" is the wrong metric, and "expected years of life lost" is the right metric. When someone dies at age 45 instead of age 60, is that a Chernobyl-caused death? What about at age 50 instead of 60? 59 instead of 75? 2 instead of 70? The answer gets more complicated the closer you look.

Ballpark: tens of thousands to even hundreds of thousands of "effective deaths" from Chernobyl, where an "effective death" is 45 years of life lost, collected from multiple affected people. Relatively few immediate deaths.