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I am curious where this comes from: ROAS = Channel Conversion Weight / Channel Budget Weight

From the description I see this as :
[Channel Orders (Attributed) / Total Orders ] / [Channel Cost / Total Cost]

how is this ROAS without revenue?

First of all, thanks for your contribution

I have a very little question to ask. How long your computer run this below chunk code to create a journey path? Though I wait more than 30 min, it seems not to be run successfully.

PS I use campaign data as you provided

Prepare the file - Create the paths

df_paths = df_split %>%
          group_by(path_id) %>%
           arrange(time) %>%
           summarise(path = paste(channel, collapse = ">"), total_conversions = sum(conversion)) %>%
           ungroup() %>% 
           mutate(null_conversion = ifelse(total_conversions == 1, 0, 1))