Stateless Logic App - Create Array

Question

I have a very simple workflow that reads from a blob (csv) and for each line in the csv it publishes a message to service bus using the Send Multiple Messages endpoint. In order for that to work out need to feed it an array of the data you want.

In a stateful app thats easy as you can init an array variable, but in a stateless app you cant.
There are data actions, like compose, which allows me to take the data from blob, split it on new line loop through each line and then create the JSON I want as the output. But want I cant seem to do is concat each line (converted to JSON) into an output array that I can feed into the Send Multiple Message endpoint.

Any suggestion would be greatly appreciated.