Draw a descendant pyramid (addition) Challenge

Given a sequence of non-negative integers, create a function that output a descendant pyramid where the children are the sum of both parent numbers.

The result is outputted as an string using tab \t.

Note: trailing tabs on each line are not required

1\t\t2\t\t3\n\t3\t\t5\t\n\t\t8\t\t results in 
1       2       3
    3       5   
        8       


Optionally result can be outputted as an array using an empty position as space. 

[[1,,2,,3],
[,3,,5,],
[,,8,,]]


Example:

Given 4,5,7,3,4,2 Output:

4       5       7       3       4       2
    9       12      10      7       6
        21      22      17      13
            43      39      30
                82      69
                    151


Rules


Standard code-golf rules apply
Input can be a string using any separator or an array
Leading/trailing newlines and tabs are permitted (but not required as long as the output is an inverted pyramid)


Test Cases

Input: 1,3,5

1       3       5
    4       8
        12


Input: 9,8,7,6,5

9       8       7       6       5
    17      15      13      11
        32      28      24
            60      52
                112


Input: 5,5,2,5

[[5,,5,,2,,5],
[,10,,7,,7,],
[,,17,,14,,],
[,,,31,,,]]

Input: 3,3,3

[[3,,3,,3],
[,6,,6,],
[,,12,,]]


Winning criteria is code-golf



Note: This challenge is very close to Generate Pascal's triangle. The difference is the custom starting sequence (pascal goes from 1 and in ascendant mode, this from an input and in descendant mode).

Sandbox post
Jelly, &nbsp;14&nbsp; 13 bytes

14 -> 13 assumes trailing spaces-only entry is allowed in the list format output; if not I shall revert to the 14 (asked)

+ƝƬK€z⁶Zṙ"JC$


A monadic link. Output is a list of lists using space characters as the spaces (includes a single trailing spaces-only entry).

Try it online! (includes a footer to show the list structure since running the monadic link as a full program will print smashed output implicitly.)