Is it possible then to pass the value from js to python without writing a seperate web_module?

web_module is a bad name, because all the module can add javascript. But If you want that javascript send the current table to server side you must write a javascript to do a rpc call. Read the documentation on the web client

I don't want to send the current table i just want to send a string containing the current tab string, i searched the web docs already but cannot understand how do i add JS than can send a string and python can receive it, and i can't find how do i add js to a module with forms without the qweb teplating engine. but thanks for your help