How do I add column field on the PDF?

You need to use #list

<#list line as lines>

${lines.custcol_bbpk_cus_project}

</#list>

or address a specific row directly:

${line[0].custcol_bbpk_cus_project}

https://freemarker.apache.org/docs/ref_directive_list.html#ref_list_items

Aha, I am learning HTML/freemarker. Thanks