Slack Webhooks Connected to Google Sheets Get Next Row - google-apps-script

Question

I have this code that works great for using an outgoing webhook in slack to fill in a google sheet, and then bounce back a formatted response from the google sheet into a slack channel, but I can't figure out how to get it to pull any other columns in the google sheet. Here is the google sheet link. So it goes as follows:
In a slack chanel you can use the outgoing webhook and post"nextrow;test;test;test
This information is filled into the google sheet with a new row
google script formats this info into a payload and posts a formatted version of the info into the slack channel
This all occurs in columns A:F and in row G there is an array formula and I would like for the google script to pull that columns value in that new row and post it back in the slack response. I tried entering in sheets.getRangeByName('test').getValue(nR,1)
but that didn't work, and I also tried sheet.getRange(noteTakerCell).getValue() but that also didn't work and it also seems to keep the whole thing from working anymore. Here is an example of the response posted back in Slack, and I would like this to include the test column new row.
Here is the code that currently works for columns A:F, I removed script I wrote for trying to get column G new row since it seems to stop everything from working. Any help would be greatly appreciated. Thanks!
function doPost(req) {
var sheets = SpreadsheetApp.openById('1P4goTvi2a7yjh-fBccRJPJ9ZFNly8OhxmABXkuhfbBQ');
var params = req.parameters;
var nR = getNextRow(sheets) + 1;
if (params.token == "[Slack Outgoing Webhook]") {
// PROCESS TEXT FROM MESSAGE
var textRaw = String(params.text).replace(/^\s*update\s*:*\s*/gi,'');
var text = textRaw.split(/\s*;\s*/g);
// FALL BACK TO DEFAULT TEXT IF NO UPDATE PROVIDED
var project = text[0] || "No Project Specified";
var yesterday = text[1] || "No update provided";
var today = text[2] || "No update provided";
var blockers = text[3] || "No update provided";
// RECORD TIMESTAMP AND USER NAME IN SPREADSHEET
sheets.getRangeByName('timestamp').getCell(nR,1).setValue(new Date());
sheets.getRangeByName('user').getCell(nR,1).setValue(params.user_name);
// RECORD UPDATE INFORMATION INTO SPREADSHEET
sheets.getRangeByName('project').getCell(nR,1).setValue(project);
sheets.getRangeByName('yesterday').getCell(nR,1).setValue(yesterday);
sheets.getRangeByName('today').getCell(nR,1).setValue(today);
sheets.getRangeByName('blockers').getCell(nR,1).setValue(blockers);
var channel = "[Slack Channel]";
postResponse(channel,params.channel_name,project,params.user_name,yesterday,today,blockers);
} else {
return;
}
}
function getNextRow(sheets) {
var timestamps = sheets.getRangeByName("timestamp").getValues();
for (i in timestamps) {
if(timestamps[i][0] == "") {
return Number(i);
break;
}
}
}
function postResponse(channel, srcChannel, project, userName, yesterday, today, blockers) {
var payload = {
"channel": "#" + channel,
"username": "New Update",
"icon_emoji": ":white_check_mark:",
"link_names": 1,
"attachments":[
{
"fallback": "This is an update from a Slackbot integrated into your organization. Your client chose not to show the attachment.",
"pretext": "*" + project + "* posted an update for stand-up. (Posted by #" + userName + " in #" + srcChannel + ")",
"mrkdwn_in": ["pretext"],
"color": "#D00000",
"fields":[
{
"title":"Yesterday",
"value": yesterday,
"short":false
},
{
"title":"Today",
"value": today,
"short":false
},
{
"title":"Blockers",
"value": blockers,
"short": false
}
]
}
]
};
var url = '[Slack Incoming Webhook]';
var options = {
'method': 'post',
'payload': JSON.stringify(payload)
};
var response = UrlFetchApp.fetch(url,options);
}