In an add-on module I am trying to create, I would like to calculate the product QOH for the input location in the search box of the tree view. But I do not know how to pass the value to the python code. I am not sure if it's highly complicated or something relatively simple. Any advice?

My finding so far is that the value you input in the search box like below...

appears in 'domain' of search_read function in main.py.

But I do not know how to pass the value to the python code in the add-on module.