You can place the data in your txt file into a spreadsheet then mass import. Each column will represent each field. Just make sure to match the content to the fields you have in your Anki deck. You can do this with any desired spreadsheet program of your choice. Here is a video of someone using LibreOffice.
https://youtu.be/BwGNP3GXmxg
https://youtu.be/BwGNP3GXmxg

