How to get the value of the variable in request item

[ma kaiyue]

How can I get the value of the variable in the multi-row in the variable set in request item, I used

variables.<variables set name>

but there is an error like this.

Thanks in advance！

[SN_Learn]

I have tried the below in background script:

var itemID = '376adcdc1baa8a905c8bea88b04bcb3f'; //sysID of RITM
var ritmGR = new GlideRecord('sc_req_item'); 
//You have to add your query according to your requirement
if (ritmGR.get(itemID)) {

var mrvsData = ritmGR.variables.service_agent_amendment.toString(); //Accessing the mrvs
var typeVariable =  ritmGR.variables.project_name; //accessing the variable of the catalog item

var mrvsVal = JSON.parse(mrvsData);
for (var i = 0; i < mrvsVal.length; i++) {
var var1 = mrvsVal[i].saa_project_name; //access the mrvs variable 1
var var2 = mrvsVal[i].service_agent_type; //access the mrvs variable 2
}
}

if(typeVariable == var2){
//Match found, return accordingly
    gs.info('Test');
}