Printing IBLPN label with cases quantity rounded to 3 decimal places

Summary:

Hello any input how can we print IBLPN case quantity rounded to 3 decimal places. I tried round it doesn't work so came up with below expression

(int(3.64321 * 1000 + 0.5) if 3.64321 >= 0 else int(3.64321 * 1000 - 0.5)) / 1000, this expression works but how do I get actual iblpn case quantity to replace 3.64321 in this example

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