Inventory Commited Qty

Hi,

I would like to update stock inventory of shopify regularly from another system.

So i’m trying to find a way to get via the API the information we can see on shopify product page : Commited Inventory Qty. (Qty we need to block for order before fullfilment)
I don’t understand reading the documentation if we can find this information ?

Do we need to get all the pending fullfilllment orders to find the qty of items commited ?

Thks

I also need help with this!