How to add connection to subgrid

Hello dear fellas,

I need to write a script that would add the opportunity owner to sales team subgrid, i`ve been looking aroung and didn`t find anything on how to do it, please help.

Here is the code I`ve written:

function SetOpportunityOwnerAsSalesMember(executionContext) {

var formContext = executionContext.getFormContext();
if (formContext == null) {
formContext = Xrm.Page;
}
var userName = formContext.getAttribute("ownerid").getValue()[0].name;
var salesTeamGridContext = formContext.getControl("SalesTeam");

if (!IsUserExistsInSalesTeam(userName, salesTeamGridContext)) {
AddUserToSalesTeam(userName)
}

}

function IsUserExistsInSalesTeam(userName, gridContext) {
var result = false;
var gridRows = gridContext.getGrid().getRows();

gridRows.forEach(element => {

var salesTeamMemberName = element.getData().getEntity().getEntityReference().name

if (salesTeamMemberName.length > 0 && userName == salesTeamMemberName) {
result = true;
}
})

return result;
}

function AddUserToSalesTeam(user) {
//
console.log("added user to sales team")
}

Best regards,

Bohdan