I have created a custom import. Model is already created and linked.
The red rectangle is what I want to add. If an other 'Entity type' is selected the dropdown will disappear.
Not mandatory but it should be better if I also remove the 'fields enclosure' checkbox.
What will be the cleaniest/easiest way to do it ?
I have checked the vendor/magento/module-import-export/Block/Adminhtml/Import/Edit/Form.php which contains the form datas, but I don't think that a plugin on it the best solution.