Extract and Reuse elements as list in JMeter

Question

[{
    elem1: value,
    elem2: value
},
{
    elem1: value,
    elem2: value
}]

I want to be able to extract all elem2 value based on a regex condition on elem1 value from a JSON response. I understand that I can do this through Regex Extractor.

In doing that I want to save the elem2 values as some sort of collection (csv file perhaps) that I could use as input for another call later on in the test.

Any help is appreciated. Thank you :)