Inputdialog - Aligning

I noted that Vim uses the proportional windows default font for his inputdialog text. (The same font as the gvim menu font)

If I create an inputdialog like this:

Let question = "Which formatting?
\ \n
\ \n1) %.2f --> Floating point number, 2 decimals
\ \n2) %10d --> Integer Right aligned (width 10)
\ \n3) %02d --> Integer with 1 leading zero
\ \n4) %g --> Floating point number, as %f or %e depending on value
\ \n5) etc
\"
let a = inputdialog(question)

The output is not aligned at all. I want to align the field starting with %, the '-->' field and the field after the '-->'.
How can I do this?

I also tried to use tabs but the result is the same.

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