How do I sum of similar properties in array of objects

I asked a similar question earlier today, but the output of this question is different. I asked wrongly the first time :(

I have a large array, which I have simplified for the question purpose

[
  {"item1": 3, "item40": 2},
  {"item1": 4, "item40": 8}
]

I would like to end up with this, which is the sum of each similar property in the array of objects. I tried a lot. Doing a forEach whith a forIn inside. But I am stuck. Please help :)

[7, 10]

Read more here: https://stackoverflow.com/questions/65725112/how-do-i-sum-of-similar-properties-in-array-of-objects