documentclass[12pt]{report}
usepackage{tikz, fontspec}
usetikzlibrary{shapes, decorations.text}
setmainfont{[Kalpurush.ttf]}

begin{document}
 ভাঙ্গা টেক্সট
begin{center}
    tikz{
         node (n1) at (0,0) [draw, shape=circle] {নোড};
         node (n2) [below left of = n1, xshift=-2ex, yshift=-3cm] [draw, shape=circle] {নোড ২};
         node (n3) [below right of = n1, xshift=2ex, yshift=-3cm] [draw, shape=circle] {নোড ৩};
         draw [->>, dashed, thick, postaction={decorate, decoration={text along path, text align=center, text=ভাঙ্গা টেক্সট, reverse path, raise=.5ex}}] (n1) to [bend right=60] (n2);
         draw [->>, dashed, thick, postaction={decorate, decoration={text along path, text align=center, text=ভাঙ্গা টেক্সট, raise=.5ex}}] (n1) to [bend left=60] (n3);
      }
end{center}
end{document}

documentclass[12pt]{report}
usepackage{tikz, fontspec, polyglossia}
usetikzlibrary{shapes, decorations.text}
setmainfont{[Kalpurush.ttf]}
setotherlanguage{arabic}
newfontfamilyarabicfont[Script = Arabic, Scale=1.5]{Traditional Arabic}
begin{document}

textarabic{وَصِيَّةً مِّنَ ٱللَّهِ}

begin{center}
tikz{
      node (n1) at (0,0) [draw, shape=circle] {নোড};
      node (n2) [below left of = n1, xshift=-2ex, yshift=-3cm] [draw, shape=circle] {নোড ২};
      node (n3) [below right of = n1, xshift=2ex, yshift=-3cm] [draw, shape=circle] {নোড ৩};
      draw [->>, dashed, thick, postaction={decorate, decoration={text along path, text align=center, text={textarabic{وَصِيَّةً مِّنَ ٱللَّهِ}}, reverse path, raise=.5ex}}] (n1) to [bend right=60] (n2);
      draw [->>, dashed, thick, postaction={decorate, decoration={text along path, text align=center, text={textarabic{وَصِيَّةً مِّنَ ٱللَّهِ}}, raise=.5ex}}] (n1) to [bend left=60] (n3);
    }
end{center}
end{document}