\version "2.19.53"

%This method aligns correctly but requires writing different tweaks for each dynamic type
dynSingleText = #(define-event-function (dyn text) (string? markup?)
       #{ 
          \tweak X-offset #-0.09
          #(make-dynamic-script
             (markup #:dynamic dyn #:normal-text #:italic (string-append " " text))) 
       #} )

pdolce = \dynSingleText "p" "dolce"
pdolcee = \dynSingleText "p" "dolceeeeeeeeeeeeeeeeeeeee"

\score { <<
  \new Staff {
    \relative c' { c\p d e f } }
  \new Staff {
    \relative c' { c\pdolce d e f } }
  \new Staff {
    \relative c' { c\pdolcee d e f } }
  \new Staff \with { \magnifyStaff #5/7 } {
    \relative c' { c\pdolce d e f } }
>> }


%This method calculates the center of the dynamic, but the results are off
#(define-markup-command (center-dyn-text layout props dyn atr-text) (string? markup?)
  (let* ((text (string-append " " atr-text))
         (atr-stencil 
           (interpret-markup layout props (markup #:normal-text #:italic text)))
         (dyn-stencil 
           (interpret-markup layout props (markup #:dynamic dyn)))
         (atr-x-ext (ly:stencil-extent atr-stencil X))
         (dyn-x-ext (ly:stencil-extent dyn-stencil X))
         (atr-x (- (cdr atr-x-ext)(car atr-x-ext)))
         (dyn-x (- (cdr dyn-x-ext)(car dyn-x-ext)))
         (x-align
           (- (/ dyn-x (+ atr-x dyn-x)) 1)))
    (interpret-markup layout props 
      (markup 
        #:halign x-align 
        #:concat (#:dynamic dyn #:normal-text #:italic text)))))
        
#(define (make-dynamic-atr-script dyn atr)
        (let* ((dynamic (make-dynamic-script (markup #:center-dyn-text dyn atr))))
             #{ \tweak X-offset 0 $dynamic #}))

pdolce = #(make-dynamic-atr-script "p" "dolce")
pdolcee = #(make-dynamic-atr-script "p" "dolceeeeeeeeeeeeeeeeeeeee")

\score { <<
  \new Staff {
    \relative c' { c\p d e f } }
  \new Staff {
    \relative c' { c\pdolce d e f } }
  \new Staff {
    \relative c' { c\pdolcee d e f } }
  \new Staff \with { \magnifyStaff #5/7 } {
    \relative c' { c\pdolce d e f } }
>> }