Importing data in bulk, into existing members

I have successfully followed Wix’s guide to import data in bulk by converting csv to json

However, this only adds new entries. What I would like to do is add data to existing entries and in mass. I know that this is possible using a form and entering data into each field separately, but is it possible to do this in a way similar to importing data with JSON, that lets you input data to already existing rows in your database.

Thanks

1 Like

I am thinking that I will need to perform some sort of query to find the row that I want to add to, and then go from there. If someone could provide the code, I would be most grateful! Thanks