Adding TMPro_SpriteAsset at runtime

I’ve been trying to add some Sprite Assets at runtime, but it looks like even although I successfully managed to add the TMP_SpriteAsset to TMP_Settings.defaultSpriteAsset.fallbackSpriteAssets, the tag is not converted into the proper sprite. I also overwrote the TMP_Settings.defaultSpriteAsset, but that didn’t do anything either. Is there something like forced updating that I’m missing? I didn’t manage to find anything about this in the documentation.