After you've found a satisfying number of minimal pairs, you may create an Anki deck with them as flashcards.
You can use the makedeck subcommand to do just that. If your minimal pairs
file is called minpairs.json, and you wanted to put the Anki deck package file
at anki-minpairs.apkg, then you'd simply run:
makedeck minpairs.json anki-minpairs.apkg
Unfortunately, the flashcards have no audio. This is not because I haven't gotten to doing it, but because there is a complete lack of free (as in beer) APIs or libraries that can (legally) furnish audio pronunciations. Forvo, which is in my opinion one of the best platforms for audio pronunciations, has an API, but it is paid. You must, therefore, add the audio yourself.
After you've created a deck package, open Anki, click on Files in the top left
corner, then Import, and then find the file and load it. A new deck,
"grzegorz's minimal pairs", should pop up. You can rename it, you can move it,
you can do anything with it. You also have control over its options, i.e. how
often you review it and whatnot.
The flashcards are fairly straightforward. There are two cards per note, and every note corresponds to a minimal pair. In each flashcard you are given a pronunciation and a simple choice between the two words in the minimal pair.
Here's an example with a flashcard's front side:
And the back side:
Every flashcard has six fields, namely Word 1 text, Word 1 audio, Word 1 IPA, Word 2 text, Word 2 audio and Word 2 IPA. Therefore, the field
contents of the flashcard in the above images look like this:
Keep in mind that the flashcards, when imported, have no audio. I added the audio pronunciation to the flashcards myself, by hand, from Forvo.