Just use an array, and splice
to add the new element e.g. to add something after position 5:
+% perl -de0
Loading DB routines from perl5db.pl version 1.32
Editor support available.
Enter h or `h h' for help, or `man perldebug' for more help.
DB<1> @ar = 'a' .. 'h'
DB<2> x \@ar
DB<3> @slice = @ar[6 .. -1]
DB<4> splice @ar, 6, @slice, 11, @slice
DB<5> x \@ar
Also see How do I handle linked lists?
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