Populate field with MS 365 Group member values in form upon creation

Forms SharePoint Online
,
1

//This works ==>

fd.spRendered(function() {

var usr1 = "GroupMember1;";
var usr2 = " GroupMember2;";
var usr3 = " GroupMember3;";
var usr4 = " GroupMember4;";
var usr5 = " GroupMember5";
var examteam = usr1.concat(usr2, usr3, usr4, usr5);

fd.field('StaffMemberLoggedIn').value = ateam;

});

//This does NOT ==>

fd.spRendered(function() {

var usr1 = "MembersofMS365Group@domain.com";
var examteam = usr1;

fd.field('StaffMemberLoggedIn').value = ateam;

});

//Considering something like this==>

fd.spRendered(function() {

var usr1 = "MembersofMS365Group@domain.com[0];";
var usr2 = " MembersofMS365Group@domain.com[1];";
var usr3 = " MembersofMS365Group@domain.com[2];";
var usr4 = " MembersofMS365Group@domain.com[3];";
var usr5 = " MembersofMS365Group@domain.com[4]";
var examteam = usr1.concat(usr2, usr3, usr4, usr5);

fd.field('StaffMemberLoggedIn').value = ateam;

});

2

Dear @shedev,
Something like this should work to retrieve all users from a SharePoint group:

pnp.sp.web.siteGroups.getByName('Contributors').users.get().then(function(result) {
  var users = [];
  for(var i = 0; i < result.length; i++){
    if(result[i].Email){
      users.push(result[i].Email);
    }
  }
  fd.field('Persons').value = users;
});

With graph client, you might be able to get MS 365 group as well - https://sharepoint.stackexchange.com/questions/283766/¨pnpjs-graph-how-to-list-all-members-of-a-group

You'll need to give graph required permissions first - Retrieve user profile information — SharePoint forms