I just installed the JS plugin and unfortunately the answer is no as this is part of the workflow of the plugin. But I am curious as to why you want to bypass this, as it will still pop up a dialog afterwards, so it will always be an interactive step.
I maintain the Import List plugin that has similar functionality, I will look if there is something that can done there (through custom actions), but I am not so sure. The problem is that matching the books is always an interactive step even if we pre-define the csv file. The advantage in the import list is that it allows for predefined settings, but you will still have to deal with the plugin wizard after the settings are applied
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