How to create nesting model relation or custom model

[akarshnagariya20]

Hoow to define model as where place contains activityCategoryIds array and activityCategoryIds contain activity

{
"name": "Hidimba temple",
"id": "62f754ec46ff51957b6a06bd",
"activityCategoryIds": [
{
"id": "62f754b9f0863190e43931e3",
"name": "worship & Temple",
"activity": [
{
"id": "62f75509f6aa851bd2719036",
"name": "Worship"
},
{
"id": "62f75516d0caf1b4651f461b",
"name": "Temple"
},
{
"id": "62f755234067ee38a34af2a0",
"name": "local market"
}
]
}
]
}