Make all occurrences of string superscript
If I were you, i will search for online superscript converter to convert that word 1 to ¹ such as https://lingojam.com/SuperscriptGenerator
Then i will copy converted text 
&gt; pages 
&gt; find &quot;[1]&quot;
&gt; change &quot;Find&quot; to &quot;Find &amp; replace&quot;
&gt; paste the copied text in the replace field &quot;[¹]&quot;
&gt; click on &quot;Replace all&quot;