Hi,
Currently in Tamil wikisource only pages from oldwikisource, wikipedia and wikibooks can be imported. Since a lot of proofread templates are required to be imported from other language wikisource such as en, fr, bn . Please enable such options for Tamil wikisource.
I think for this some options in this page has to be changed here
https://noc.wikimedia.org/conf/highlight.php?file=InitialiseSettings.php
in the section wgImportSources ---> tawikisource