Shortcode to show “Price per weight” in the article description

Hello dear WordPress-Community,

i have the following question:
Shortcode to show “Price per weight” in the article description

We have to show in all our products the info “price per kilogram” with a formular, so that we change the prices or the VAT changed, that always the correct unitprice is shown, for example:

– product weight: 0,5kg
– product price 4,00 EUR

Formula Price per Weight: 4,00/0,5 = 8
>> So in the article description we want to write:
“Preis / kg:” [shortcode-price-per-weight] “pro kg”
>> so the website visitor will see “Preis / kg: 8,00 EUR pro kg”

Can you give me the code for the functions.php to create this shortcode with this formular? Thank you very much in advance!