How to add custom footer to a specific page?

MWE:

documentclass[12pt, titlestyle=hang,twoside]{elegantbook}
setcounter{tocdepth}{3}% to show subsubsections and paragraphs in TOC?
setcounter{secnumdepth}{3}% to show subsubsections and paragraphs in TOC?
usepackage{attachfile}% to embedd audio file
usepackage{graphicx}
usepackage{rotating,multirow}

usepackage{tabularx}    % <---
usepackage{longtable}



%--------------------------------------------------
%Bengali Font in Document
%--------------------------------------------------
tracinglostchars=2
% For a bilingual document
RequirePackage{fontspec}
RequirePackage{polyglossia}

defaultfontfeatures{Ligatures=TeX, Scale=MatchUppercase}
% Times New Roman used for English
%setmainfont{Times New Roman}
%setmainfont{Times New Roman}[NFSSFamily=ntxtlf]
setmainlanguage{bengali}
setotherlanguage{english}


% Bengali
newfontfamilybengalifont{Kalpurush}[
  Script=Bengali,
  Language=Bengali,
  AutoFakeBold = 0.2,
  AutoFakeSlant = 0.15  ]


renewcommand{chaptermark}[1]{markboth{chaptername~thechapter , #1,}{}}
titleformat{chapter}[style]{bfseries}
     {filcenterLARGEenspacebfseries{color{structurecolor}%
       IfAppendix{appendixname}{chaptername~thechapter}enspace}}
     {1pt}{bfseriescolor{structurecolor}LARGEfilcenter}

%End--------------------------------------------

%--------------------------------------------------
%Arabic  Font in Document
%--------------------------------------------------
usepackage{arabxetex}

%setotherlanguage{arabic}
 
setmainfont{Amiri}
newfontfamilyarabicfont[Script=Arabic,Scale=1.1]{Amiri}

%End--------------------------------------------


%% new:

renewcommandtabularxcolumn[1]{m{#1}}
usepackage{booktabs}
usepackage[skip=0.25baselineskip,font=Large]{caption}

%==================

%==================


begin{document}

Requird custom footer for specific pages.


vfill
begin{center}
scriptsize
begin{tabular}{lllllll}
begin{tabular}{c}
tikzdraw[color=blue,fill=blue] (0,0) rectangle (0.5,0.5);
end{tabular}! ইখফা & 

 begin{tabular}{c}
tikzdraw[color=red,fill=red] (0,0) rectangle (0.5,0.5);
end{tabular}! ইখফা মীম সাকিন &

 begin{tabular}{c}
tikzdraw[color=yellow,fill=yellow] (0,0) rectangle (0.5,0.5);
end{tabular}! ক্বলক্বলা &

 begin{tabular}{c}
tikzdraw[color=cyan,fill=cyan] (0,0) rectangle (0.5,0.5);
end{tabular}! ক্বলব & 

 begin{tabular}{c}
tikzdraw[color=blue,fill=blue] (0,0) rectangle (0.5,0.5);
end{tabular}! ইদগাম & 

 begin{tabular}{c}
tikzdraw[color=green,fill=green] (0,0) rectangle (0.5,0.5);
end{tabular}! ইদগাম মীম সাকিন & 

 begin{tabular}{c}
tikzdraw[color=magenta,fill=magenta] (0,0) rectangle (0.5,0.5);
end{tabular}! গুন্নাহ
end{tabular}
end{center}
end{document}

This gives:

But I would like to get :

Here is the complete file.

usepackage{fancyhdr}
fancyfoot[C]{...your code...}
pagestyle{fancy}

usepackage{fancyhdr}
fancyfoot[C]{scriptsize
begin{tabular}{lllllll}
begin{tabular}{c}
tikzdraw[color=blue,fill=blue] (0,0) rectangle (0.5,0.5);
end{tabular}! ইখফা & 
%
 begin{tabular}{c}
tikzdraw[color=red,fill=red] (0,0) rectangle (0.5,0.5);
end{tabular}! ইখফা মীম সাকিন &
%
 begin{tabular}{c}
tikzdraw[color=yellow,fill=yellow] (0,0) rectangle (0.5,0.5);
end{tabular}! ক্বলক্বলা &
%
 begin{tabular}{c}
tikzdraw[color=cyan,fill=cyan] (0,0) rectangle (0.5,0.5);
end{tabular}! ক্বলব & 
%
 begin{tabular}{c}
tikzdraw[color=blue,fill=blue] (0,0) rectangle (0.5,0.5);
end{tabular}! ইদগাম & 
%
 begin{tabular}{c}
tikzdraw[color=green,fill=green] (0,0) rectangle (0.5,0.5);
end{tabular}! ইদগাম মীম সাকিন & 
%
 begin{tabular}{c}
tikzdraw[color=magenta,fill=magenta] (0,0) rectangle (0.5,0.5);
end{tabular}! গুন্নাহ
end{tabular}}
pagestyle{fancy}