I'm not sure I completely understand your question, but if the goal is to also include episodes which don't have an alias, you can use this:
[{
"id": "/m/07mx74h",
"/tv/tv_series_season/episodes": [{
"limit": 1000,
"mid": null,
"name": null,
"/common/topic/alias": []
}]
}]
The inner text value is the default returned, so you don't need the inner curly braces.