How to make the same indents for multi-line flexbox?

Question

css

I have a flexbox with justify-content: flex-start . It's multiline. I need to achieve the same behavior as if it were justify-content: space-around , only that the elements on the last line (and there will almost always be fewer of them) are positioned exactly below the elements of the previous one. I tried to calculate the indents using calc, but everything depends on the number of elements in the line. Variants without using flex are also welcome, if they behave in a similar way. I hope for a solution without js.