If you are trying to assign user(s) to the current rows item, the below can work. If your objective is different please provide more information in terms of what you are trying to have as an outcome.
You can either add a “add button”, which will take the selected user(s) in the “G-search user table”, next to your remove button. Then the button’s workflow will assign user(s) in the list of the ones in your “G-search user table” to the item that has the same ID.
Alternatively, you can add a customs state that captures the ids of the user(s) in “G-search user table” and the id of the current row item. Then your “add button” can run a workflow using what has been added to the state from outside the table.
You can view this link as an example.