How to Modify a syntax node/Trivia of a SyntaxTree and then Create a new .cs file from the Syntaxtree

I'm trying to replace some code/comment it with custom solution at specific position. I'm not creating an analyzer to detect the issue and waiting for user to click bulb and fix it. I'm working on a normal console Application. the purpose is I've multiple different custom Codefix which'll run as a batch and fix it through out a whole Project.

var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(new Claim[]
            {
                new Claim(ClaimTypes.Name, userDetails.Id.ToString()),
                new Claim(ClaimTypes.Role, userDetails.Role),
                new Claim(ClaimTypes.UserData, userDetails.Password)// Claim contains user's password  
            }),
            // Additional parameters... //
        };

current I want to comment the "new Claim(ClaimTypes.UserData, userDetails.Password)" line and also the "," before the line by replacing the Syntax node content or insert "//" at the start of the Span and "//" before the comma as well.

This is where I'm stuck, below are code snippets on how I'm deciding where to apply the fix.

/* After read the .cs file from config I'll have a List of this object by which I'll know where to apply the fix*/

public class FormattedXML
    {
        public string? FileName { get; set; }
        public string? MethodName { get; set; }
        public int? LineNumber { get; set; }
        public string? LineCode { get; set; }
    }

/After using CSharpSyntaxTree.ParseText(code) to read the whole .cs file/

public static void JwT001(SyntaxTree st, FormattedXML Issue)
    
    {
            var root = (CompilationUnitSyntax)st.GetRoot();
            var objectCreations = from r in root.DescendantNodes().OfType<ObjectCreationExpressionSyntax>() select r;
            foreach (var objectCrreation in objectCreations.ToList())
            {
                string Line = objectCrreation.ToFullString();
                if (Line.Trim() == Issue.LineCode.Trim())
                {
                    var span = objectCrreation.FullSpan;
                    var node = st.GetRoot().FindNode(span);// Has the line that needs to be commented
                    var abc = node.Parent.FindToken(span.Start - 1); //"," needs to be commented
// How do I access this comma which is part of the previous objeccreationExpression node

                    //var bc = node.WriteTo();
                }

            }
        }

Now I've the node at hand, the span where i can apply fix.

How do I apply the fix and create the whole SyntaxTree again and create a .cs file again from it?