If you are attempting to do it through simple xml:
SimpifedXMLDrilldown on Splunk Docs
On that Page Scroll down to the Predefined Drilldown Tokens section, then look under the Table subsection. Here are the options I believe you may be looking for EG:
**table**
**Token**
Description
$click.name$ Leftmost field (column) name in the table. Typically, _time is leftmost in a table that includes this field and where columns are ordered by default.
$click.value$ Leftmost field (column) value in the clicked table row.
$click.name2$ Clicked field (column) name. In a <condition> element configuring drilldown in a table, field corresponds to $click.name2$.
$click.value2$ Clicked field (column) value. Use this token to capture the specific table cell value that users click.
$row.<fieldname>$ Access any field (column) value from the clicked table row.
$earliest$ Earliest time for the clicked table row. If not applicable, uses the earliest time of the search.
$latest$ Latest time for the clicked table row. If not applicable, uses the latest time of the search.
An Example in dashboard usage:
Example
A click on the table sets a token which is consumed by the search of the chart visualization.
<dashboard>
<label>In-page Drilldown</label>
<row>
<panel>
<table>
<title>Set sourcetype token on click</title>
<search>
<query>
index=_internal | stats count by sourcetype
</query>
<earliest>-1h</earliest>
<latest>now</latest>
</search>
<drilldown>
<condition field="sourcetype">
<set token="sourcetype">$click.value2$</set>
</condition>
</drilldown>
</table>
<chart>
<title>Chart for $sourcetype$</title>
<search>
<query>
index=_internal sourcetype=$sourcetype$ | timechart count by sourcetype
</query>
<earliest>-1h</earliest>
<latest>now</latest>
</search>
</chart>
</panel>
</row>
</dashboard>
So as for what you are looking for, assuming you want the clicked value to be part of the link:
<table>
<search>index=_internal</search>
<!-- Pass the clicked cell's value, earliest time, -->
<!-- and latest time to a destination form's -->
<!-- token ('foo') and search parameters -->
<drilldown>
<link>
<![CDATA[
/app/search/simple_xml_form?form.foo=$click.value2$&earliest=$earliest$&latest=$latest$
]]>
</link>
</drilldown>
</table>
You can find many more examples in the drilldown section of the link above.
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