Firestore Query Across Multiple Fields for Same Value

Is it possible to query multiple fields in a firestore document for the same value?

Imagine I have numerous documents where each described a sport:

sportsRef.collection("sports").documents [
["bowling" : [
"equipment": "bowling ball, bowling alley, bowling shoes",
"description": "bowl the ball" ]]

["football": [
"equipment": "ball, boots, shin pads, goalie gloves",
"description": "kick the ball in the goal" ]]

["darts": [
"equipment": "darts, dartboard",
"description": "throw the dart at the board" ]]

["boxing": [
"equipment": "boxing gloves, ring",
"description": "punch your contender" ]]

["shot put": [
"equipment": "shot put",
"description": "throw the shot put, looks like a ball" ]]
]

Is there any way to make a query that, if I searched for a value of "ball", would return all the documents that have "ball" within their values. So in this case I would be returned bowling, football and shot put ("ball" is in the description of shot put).

The reason why I ask is because I have implemented a UISearchController in my iOS app and am trying to do the search in my Firestore by constructing a query in my app.