@Krishnakumar Venkatachalam Apologies for delay in getting back to this thread.
Currently there isn't any out of box feature within Application Insights for you to consume where request body is sent automatically to Application Insights. You have to use Application Insights SDK and send this manually to Application Insights.
However our internal team has been made aware of this feedback , they have got similar feedback from few other customers. So they will be evaluating the feedback and prioritize accordingly.
On a side note , below are few sample solutions explored and shared by community members , hope it helps you. Credit to respective owners who have posted these solutions.
https://stackoverflow.com/questions/42686363/view-post-request-body-in-application-insights
https://mahmutcanga.com/2020/04/08/tracking-request-body-via-application-insights/
https://microsoft.github.io/AzureTipsAndTricks/blog/tip301.html
Hope the above information helps. Please let us know if you have any other queries. Thank you