Writing the code in loop

You have to create a rule for this in which you can apply looping

a!localVariables(
  local!data: { 1, 2, 3, 4 },
  local!data2: { 1, 2, 3, 4 },
  local!data_count: length(local!data2)+1,
  a!forEach(
    items: local!data,
    expression: concat(
      "<tr><td>" & fv!item & "</td><td>
" & local!data2[local!data_count - fv!index] & "</td>
</tr>"
    )
  )
)

Thank you so much  ujjwal, It was helpfull.

In my case I have a cdt as local!data2 and I want different field name for every row.

In this case, I think you should create your own logic which would be something like this 

a!localVariables(
  local!data: { "Name","Date","Comment"},
  local!data2: {
    a!map(
      name:"Ujjwal",
      date:now(),
      comment:"I want to learn Appian"
    ),
    a!map(
      name:"Ujjwal",
      date:now(),
      comment:"I want to learn Appian"
    ),
  },
  local!data_count: length(local!data2),
  a!forEach(
    items: enumerate(local!data_count),
    /*expression: local!data_count-fv!index*/
    expression: concat(
      "<tr><td>" & local!data[1] & "</td><td>
" & index(local!data2,fv!index,"name",{}) & "</td>
</tr>"&
"<tr><td>" & local!data[2] & "</td><td>
" & index(local!data2,fv!index,"Date",{}) & "</td>
</tr>"&
"<tr><td>" & local!data[3] & "</td><td>
" & index(local!data2,fv!index,"Comment",{}) & "</td>
</tr>"
    )
  
))

In this case, I think you should create your own logic which would be something like this 

a!localVariables(
  local!data: { "Name","Date","Comment"},
  local!data2: {
    a!map(
      name:"Ujjwal",
      date:now(),
      comment:"I want to learn Appian"
    ),
    a!map(
      name:"Ujjwal",
      date:now(),
      comment:"I want to learn Appian"
    ),
  },
  local!data_count: length(local!data2),
  a!forEach(
    items: enumerate(local!data_count),
    /*expression: local!data_count-fv!index*/
    expression: concat(
      "<tr><td>" & local!data[1] & "</td><td>
" & index(local!data2,fv!index,"name",{}) & "</td>
</tr>"&
"<tr><td>" & local!data[2] & "</td><td>
" & index(local!data2,fv!index,"Date",{}) & "</td>
</tr>"&
"<tr><td>" & local!data[3] & "</td><td>
" & index(local!data2,fv!index,"Comment",{}) & "</td>
</tr>"
    )
  
))

here in line 20 I want again looping, as index value will be passed from rule input 

Sorry for the trubble and thanks in advance

Have you tried it? What was the issue.