Yes it is possible. aria2 gives you the power of downloading multiple files at once. To do that. Just open your terminal. Create a blank file using the touch command.

touch ~/aria2-torrents

Now use the echo command to add the torrent Magnet links, Torrent file links to the aria2-torrents text file.

Note: make sure to replace the torrent link with your Magnet link or your Torrent file locations.

echo 'torrent-link 1' >> ~/aria2-torrents
echo 'torrent-link 2' >> ~/aria2-torrents
echo 'torrent-link 3' >> ~/aria2-torrents

With this command, all your files are listed in your text file. Now just run this file using :

aria2c -i ~/aria2-torrents

It will start downloading all files at the same time.