The tab position is defined in InDesign - either by overriding the selected paragraph setting, or by defining a paragraph style.
You can add the tab character to your address ADOR using qlingo: \t & |->[address]
I am not sure that you really want to "script" the position? Are you saying that you want the address of record 1 centered at 6 pica, and record 2 at 7 pica?
If this is what you want, you can use Adobe Tagged Text - this will give you the opportunity to change the tab position in the text file.
For example, this qlingo:
"<UNICODE-WIN>\r\n" &
"<Version:15.1><FeatureSet:InDesign-Roman><ColorTable:=<Black:COLOR:CMYK:Process:0,0,0,1>>\r\n" &
"<DefineParaStyle:centered=<Nextstyle:centered><pTabRuler:72\,Center\,.\,0\,\;>>\r\n" &
"<ParaStyle:centered>\t" & |->[address]
defines the font face, size, color and tab position (in pts).