Changing the per kg price on a listing

Hello!

I was researching into whether it is possible to change the ‘price per kg’ factor on my amazon listing? Upon research however, it seems you have to open a case log with Amazon to do this. I was wondering whether this has changed and there is a way to do it myself on the edit section of the Amazon listing as I see other sellers of similar products to mine have been able to change the ‘price per kg’ to ‘price per gram’ or ‘price per count’.

For context - I list a product at £8.99 per 100g. My listing is also showing the price per kg. It is really high (in reality, the price per kg would reduce significantly).

Thanks so much in advance!