Power Query Function - get column name - powerquery

Question

I have different files containing various attributes (one file will have Job Name, another one will have Location, another one will have Grade, etc.).
Sample Data:
Job Name
Job Location
Job Grade
Controller
Some values
High
Director
No Values
Low
Analyst
Some Other values
VP Of Finance
Blank
Medium
Director
I want to have a function that will add a column in which each cell will have combined: the Column Name (Job Name in case of the above sample) AND length of the Column Name (Length of each Job Name in case of the above sample).
Desired Output:
Job Name
Job Location
Job Grade
Desired Output
Controller
Some values
High
Job Name 10
Director
No Values
Low
Job Name 8
Analyst
Some Other values
Job Name 7
VP Of Finance
Blank
Medium
Job Name 13
Director
Executive
Job Name 8
What I have is:
(MyColumn) as text =>
let
Source = Text.Length(MyColumn),
NewSource = Number.ToText(Source),
FinalText = Text.Combine({MyColumn,NewSource}," ")
in FinalText
I need to find a way to reference the column name to be added to the FinalText, because for now the output is following:
Job Name
Current Output (incorrect!)
Engineer
Engineer 1
Director
Director 2
Analyst
Analyst 3
Engineer
Engineer 1
Btw I tried using Record.Field(_, MyColumn) but it didn't work with below error:
An error occurred in the ‘’ query. Expression.Error: The name '_' wasn't recognized. Make sure it's spelled correctly.
Thank you in advance for help.
Edit: I have edited the post, I hope it's more clear now.

Answer 1

Is this what you want?
zzz = Table.AddColumn(#"PriorStepNameHere", "Custom", each Table.ColumnNames(#"PriorStepNameHere"){0} &" "& Text.From(Text.Length(Record.Field(_,Table.ColumnNames(#"PriorStepNameHere"){0}))))

Answer 2

Here is a similar answer.
Table1 looks like this.
Job Name
Controller
Director
Analyst
VP Of Finance
Director
let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Added Custom" = Table.AddColumn(Source, "Output", each Text.Combine({
Table.ColumnNames(Source){0}," ",
Text.From(Text.Length(Record.Field(_,Table.ColumnNames(Source){0})))
}))
in
#"Added Custom"
Edit 1 from comment:
Based on what you want I recommend that you don't use "Add Column>Invoke Custom Function". Instead in the "Applied Steps" right click and choose "Insert step after" you would then type in the =function_name(prior_step_table,number_of_column) the function is below.
(Table as table, column_n as number) =>
let
Source = Table,
#"Added Custom" = Table.AddColumn(Source, "Output", each Text.Combine({Table.ColumnNames(Source){column_n}," ",Text.From(Text.Length(Record.Field(_,Table.ColumnNames(Source){column_n})))}))
in
#"Added Custom"