Experimenting with this and found that simply adding the .json file a config directory in the module seems to work, I assume the same might be true for themes.
I ran into this problem again, now I understand, I can simply edit View and changing the „Remember the Last Selection“ option. Unlike Drupal, Backdrop use Views for the Content page, I forgot...
I don't think this answers your question, but it might help someone with a related question.
The layout template for any given layout is stored in config and you can programmatically...
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Experimenting with this and found that simply adding the .json file a config directory in the module seems to work, I assume the same might be true for themes.