<How can I only accept numbers in the TextField an...

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How can I only accept numbers in the TextField and max 1 number als input from user? (Kotlin)
//2 dimensional array mit default size 4
var gridSize by remember { mutableStateOf(4) }
var grid by remember { mutableStateOf(Array(gridSize) { Array(gridSize) { TextFieldValue("") } }) }

Column(modifier = Modifier.padding(16.dp)) {
//looping through rows & columns
for (i in grid.indices) {
Row(modifier = Modifier.fillMaxWidth()) {
for (j in grid[i].indices) {
// Render each cell as TextField
TextField(...