How to get a String from an xml file when using an object in Jetpack Compose?

Instead of direcly write "red", "yellow" and "green", I would like to get the string from xml.

object Apples {
    val apples = listOf("red", "yellow", "green"
    )
}

I have tried val context = LocalContext.current but it is not working.

It is not possible to access context inside object. I suggest you, instead of writing colors directly, use something like this:

object Apples {
    val apples = listOf<Int>(
        R.string.red,
        R.string.yellow,
        R.string.green,
    )
}

This way, when you need to output any of the values, you simply call stringResource(apples[0]).

That being said, I might (depending on the use case) solve this by using enum:

enum class Apples(val nameResId: Int) {
    Red(R.string.red),
    Yellow(R.string.yellow),
    Green(R.string.green)
}

The actual presentation of the string should not be baked into the object itself, but rather the UI should take care of it. While you probably could make a @Composable function inside the object, you will create another composable function you won't be able to use outside composable functions.