I managed my way and found the solution, and I would like to share it.. :)

I added new function field to product.product object, and inside this function I have read the wizard table and return a proper result.

Then, I added the new field name in product_label.xml, then I were able to read the field value from product_label.xsl by the following code:

<xsl:variable name="temp_var"><xsl:value-of select="field_from_wizard"/></xsl:variable>
<xsl:if test="$temp_var='Code128'">
    <barCode code="Code128"><xsl:value-of select="field2" /></barCode>
</xsl:if>

This maybe not the optimal solution. however, it solved the problem.

Hope it will help someone else..%