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Ok, here is my suggestion:

1. Create a file with the list of numbers that you want to put:
$ cat file
24 35
100 200
555 666

2. Run below awk code to generate the XML by reading the file...

The portable way is to use tput: Man Page for tput (Linux Section 1) - The UNIX and Linux Forums (https://www.unix.com/man-page/Linux/1/tput/)


tput smso ... bold on
tput rmso ... bold off
tput...

awk '{$2=v}1' v="$var" file