Looks good to me.
As you’re now duplicating code it would be better to wrap it all up into a helper function.
const findOrCreateFolder = async (parentFolder, folderName) => {
const entries = await parentFolder.getEntries();
const foundFolder = entries.filter((entry) => entry.isFolder).find((subFolder) => subFolder.name === folderName);
if (foundFolder) {
return foundFolder
}
return await parentFolder.createFolder(folderName)
}