How to add a basic implementation for a property in Android development?

You can use a backing property.

class Example {
    private var _data: List<String>? = null

    val data: List<String>
        get() {
            if (_data == null) {
                _data = loadData() // Data loading function
            }
            return _data ?: emptyList() // Return data or empty list
        }

    private fun loadData(): List<String> {
        // Data loading logic
        return listOf("item1", "item2")
    }
}