Uploading existing signature list

Hi there,

I have a list of people who have already signed my petition before I installed this plugin so I am wanting to upload a csv file that contains all of these people so that they will appear on the generated list of supporters and be included in the counter of how many people have signed on, is this possible? And if so how do I do this?

Thanks

https://www.ads-software.com/plugins/speakup-email-petitions/