How to build custom json fields for endpoint?

Apologizes on terminology mistakes. I’m an ios dev working with Strapi devs so I can only explain in general terms that I researched or know of from ios and JS thus far

I am building a mobile app that GETS a JSON request from the auto generated Strapi endpoint say “/events”
Its returning all fields and anything has-many of collections associated with it. Example, events array has-many venues

  "id": 76,
  "title": "Neat picnics",
  "urlExternal": "...",
  "guestLimit": null,
  "published_at": "2022-06-13T19:54:09.408Z",
  "created_at": "2022-06-13T19:54:06.234Z",
  "updated_at": "2022-06-30T00:00:01.744Z",
  "subtitle": null,
  "guid": "c436e93b-699f-496c-a70f-782250faaeba",
  "venues": [{
    "id": 49,
    "name": "name",
    "published_at": "2021-09-17T17:20:57.876Z",
    "created_at": "2021-09-17T17:20:55.793Z",
    "updated_at": "2022-01-24T13:12:59.527Z",
    "facebookUrl": null,
    "instagramUrl": null,

What i would like is one or two options

Have Strapi send a vary paired down results say removing facebookUrl, instagramUrl, etc, i removed a lot for this example

Have Strapi not send the has-many “venues” data in full and instead just send the “name” and the GUID or id so I can do a lookup at some other point.

Either some pointers for custom GET request or some config the Strapi team im working with could look over and implement some how would help a ton.

I will happily revise the question if necessary. Thank you