Here you go:

 const { boardId } = req.body;
  const { description, status, title } = req.body.task;

  const [createTask] = await prisma.$transaction(async (prisma) => {
    const createTask = await prisma.task.create({
      data: {
        board: boardId,
        description,
        status,
        title,
      },
    });

    const statusArray = await prisma.board.findUnique({
      where: {
        id: boardId,
      },
      select: {
        [status]: true,
      },
    });

    const updateBoardStatusArray = await prisma.board.update({
      where: {
        id: boardId,
      },
      data: {
        [status]: {
          set: [...statusArray[status], createTask.id],
        },
      },
    });
    
    return [createTask, statusArray, updateBoardStatusArray];
  });

  // return data from first query
  res.status(201).json({ task: createTask });

You can learn more about Interactive Transaction here