General product quantity calculated by sum of options

Hello,

I'm loving Opencart but there is one thing missing.
How can I automatically calculate the total sum quatity of the product options in admin?

An example.
In Prestahop, if you use options, then the general quantity will be the sum of the quantity of the options.

Can anyone help me?

Thanks.

Created this for Opencart 3. x version for free. Link to download:
Sum of option qty to Main product quantity