Make VirtualizedList show as Grid - react-native

Question

I'm trying to make something like this:
The problem: The project was built with immutablejs and according to React Native Docs, I can't use FlatList thus I can't use numColumns props feature of that component.
AFAIK, my only choice is to use VirtualizedList as the docs points out, but I can't figure out how to display the cells as a grid as shown above.
I've already tried to add style props in both cell and view wrapper, but none of the code used to align the cells, like the picture I posted, is ignored. In fact it was showing perfect when I was using ScrollView, but due the HUGE lag I'm moving the code to VirtualizedList.
Any help? Anything would be welcome, I already digged a lot on Google but I can't find anything about this.
Some sample code:
<View>
<VirtualizedList
data={props.schedules}
getItem={(data, index) => data.get(index)}
getItemCount={(data) => data.size}
keyExtractor={(item, index) => index.toString()}
CellRendererComponent={({children, item}) => {
return (
<View style={{any flexbox code gets ignored here}}>
{children}
</View>
)}}
renderItem={({ item, index }) => (
<Text style={{also here}} key={index}>{item.get('schedule')}</Text>
)}
/>
</View>

Answer 1

Answering my own question:
I got it working by copying the FlatList.js source code from react-native repo.
Here's an example code:
<VirtualizedList
data={props.schedules}
getItem={(data, index) => {
let items = []
for (let i = 0; i < 4; i++) {
const item = data.get(index * 4 + i)
item && items.push(item)
}
return items
}}
getItemCount={(data) => data.size}
keyExtractor={(item, index) => index.toString()}
renderItem={({item, index}) => {
return (
<View key={index} style={{flexDirection: 'row'}}>
{item.map((elem, i) => (
<View key={i}>
<Text key={i}>{elem.get('horario')}</Text>
</View>
))}
</View>
)
}}
/>
The number 4 is for the number of columns. The key parts are in the getItem and adding flexDirection: 'row' at renderItem in the View component.