Adding search data?

Is there a way to add additional search criteria to episode metadata so that they come up in searches?

Example:

S01E02 of Good Eats is titled “This Spud’s for You”. If a user searches on “potato” it will not come up. I’d like to add the actual topic ingredient to each episode (without fudging up the displayed titles)

No, only media titles are searched, see Search | Plex Support.

Unsure if there might be a 3 party tool for it,
not that I’m awere though.