react-window set item size according to content height

I'm using react-window to implement a chat message list, but I'm getting stuck trying to set the right itemSize to each item. Happens that a chat message, based on his text length and window width, hasn't always a prefixed height (or a height that i can calculate in a simple way).

I'm currently using a VariableSizeList and the code looks like this

<AutoSizer>
    {({ height, width }) => (
       <List
        height={height}
        itemCount={messages.length}
        itemSize={(index) => messages[index].isReply ? 118 : 79} /* THIS IS CURRENTLY WRONG, DOESN'T PICK ALL CASES!*/
        width={width}
       >
         {({ index, style }) => (
           <ChatMessage
            key={index}
            style={style}
            ...
           />
         )}
       </List>
    )}

Is there a way to set the item height of the list row equal to the ACTUAL height of its content?