Hi @hs_vk
You've not had a response on this one for sometim so let me try and suggest how it should be done.
When using web sdk, you can easily achieve this. Within launch, you would need to create a data element which would concatenate the values from the datalayer. Once you have this data element ready, you would either need to create an XDM Object type data element or would need to update an existing one where you would map the data element created earlier to eVar1 value within the adobe analytics experience event template field group.
Once you've done this, you would need to use the XDM object data element in a launch rule.
Here are a few links you can read up:
https://experienceleague.adobe.com/docs/experience-platform/xdm/field-groups/event/analytics-full-extension.html?lang=en
Let me know if you need further help with the setup cause I am not aware of how much you already know about setting up the sdk through Launch.
Cheers.