How to change default order of nodes in a sankey diagram

Question

I created a Sankey diagram using the plotly package.

As far as I see, the default order of nodes is mostly defined by the value. However, I want the alphabetical order without manually moving nodes with mouse drug.

Can I change the default order with R?

Any help would be greatly appreciated. Below is an example code and the outputs:

node_label <- c("x1_1", "x1_2", "x2_1", "x2_2")
link_source <- c(0, 0, 1, 1)
link_target <- c(2, 3, 2, 3)
link_value <- c(2, 5, 1, 3)
# when link_value <- c(5, 2, 1, 3), the order is changed.

plotly::plot_ly(
  type = "sankey", 
  domain = list(x =  c(0,1), y =  c(0,1)), 
  node = list(label = node_label),
  link = list(
    source =  link_source,
    target = link_target,
    value =  link_value))

Answer 1

With @banderlog013's advice, I achieved to manually define the order of nodes.
Big thanks !!!
Below is my example answer.

node_label <- c("x1_1", "x1_2", "x2_1", "x2_2")
node_x <- c(0, 0, 1, 1)
node_y <- c(0, 1, 0, 1)
link_source <- c(0, 0, 1, 1)
link_target <- c(2, 3, 2, 3)
link_value <- c(2, 5, 1, 3)

plotly::plot_ly(
  type = "sankey", 
  arrangement = "snap",
  node = list(
    label = node_label,
    x = node_x,
    y = node_y,
    pad = 20),  
  link = list(
    source =  link_source,
    target = link_target,
    value =  link_value))

And please a bit drug a node to reflect the nodes position.