Adding custom dynamic values to matrix table

You can set an embedded data field for each matrix row then pipe that value into your matrix statements (row labels). Like:
${e://Field/row1}
${e://Field/row2}
${e://Field/row3}
The best way would be to upload your csv into a database table on a web server, then use a web service to assign values to the row embedded fields (row1, row2, etc.).
Alternatively, you could convert your csv to a JS object and use JS to assign the embedded fields. With this approach, you would separately need to define the embedded fields in the survey flow if you want the values saved in your Qualtrics data.

TomG Thank you for the response! I appreciate it.
Let me clarify my question a little. I don't need to save the values for each row, since I will have those stored externally. I will only need to save one embedded datapoint to indicate which subgroup was displayed for that particular respondent.
My goal (in very rough pseudocode) looks like this:
array rowVals = read_csv("subgroup1.csv");
int numRows = rowVals.length;

for (int i = 0; i < numRows; i++) {
// set the row label (statement value) for row i to rowVals[i]
}
where the spreadsheets subgroup1.csv, ..., subgroup100.csv are saved in my Qualtrics file library.
The primary hurdles are (a) reading a CSV from my library via JS, and (b) setting the row values themselves. I think I understand the gist of your suggestion, but I'm unfamiliar with the syntax for reading in a CSV or assigning matrix-table row values within Qualtrics JS. If you could provide some basic examples that would be great.
Thank you again for the help!

TomG Bumping this, it would be awesome to have a little more guidance here. Thank you!