I tried the xpath solution seems to be not working . Not sure if understand this "Add a role field with many2one/selection type on user or on partner level."

Hi Shibi,

Let me help you with the xpath:

<template id="show_email_on_login" inherit_id="portal.user_dropdown">
<xpath expr="//span[@t-if='_user_name']" position="replace">
<span t-if="_user_name" t-attf-class="#{_user_name_class}" t-esc="user_id.email[:23] + '...' if user_id.email and len(user_id.email) &gt; 25 else user_id.email"/>
</xpath>
</template>

With this xpath, I am able to show email instead of the Customer name, similarly you can relace your field on above xpath with email to show ROLE .
Thanks

Thanks.