I thought that it might be useful for other people to learn how to become a power user with their LLN exports until the Anki export feature is more customizable!
This will require a small amount of using your operating system's terminal; I can help you if you have a Windows system, but this is written assuming you're using a Mac or Linux.
Download the JSON file of your vocabulary from LLN. (Saved Items → Export → JSON). It should be somewhere accessible and named something like lln_12345678.ndjson.
Open your terminal and install jq.
<aside> 💡 If you're on a Mac, you'll need Homebrew as well; on Windows, Chocolatey.
</aside>
Determine what fields you want from the JSON - see the Appendix below for a list of all the possible fields.
The fields I care about are word, wordTranslit, wordDefinition, and subtitle.
Determine the order that you would like the columns to be printed in. For example, my columns are Hanzi, Pinyin, English, and Example; you can re-map them when importing, but it's easier to get it right the first time.
I'll break mine down. All examples here will work on a Mac, and most likely Linux.
cat **{file location}** | jq '.[]|[**{fields you want}**] | @csv' -r > **{file to save}**
This is essentially a flow from left to right: we're reading the file, picking out (and transforming) the fields that you want, and telling jq that we want to spit it out as a CSV, which Anki gobbles up. This is some pretty heady stuff - you're basically writing an Extract, Transform, Load operation! Let's fill it out, replacing the stuff in brackets (and the brackets themselves).
The file that you downloaded from LLN - if you're on a Mac, that's most likely in your Downloads folder. Using some shorthand, that will look something like:
cat ~/Downloads/lln_json_items_2021-1-4_2667878.ndjson
If you want to learn more about this, go here.
You already have a list of the fields you want - now it's time to extract them using the following format. I'll give an example of what mine looks like.