Hi
I have below code that generate a table that look like below:

Sort(
Filter(
INCO_REQUESTS;
Status = "Submitted for Action" And IsBlank(Email)
);
Submitted_Time;
Ascending
)
What i'm looking for is to be able to concatenate "First_name" column based on "Last_name" column.
So if we look at the table above, we have 2 time "Carlson". So both first name would get concatenated separated by a comma like below:

How can this be done?
Thank you for your help.