Autofill username from Provider (smartsheet) when redirected to authentik page

Hello, Thank you for this fine tool. I have set up SSO SAML2 between authentik and smartsheet.
What i am trying to achieve is that when the users inputs his/her username on smartsheet and presses the "login with company account" button, the username gets captured and autofilled on authentik page (after redirection from smartsheet takes place) so the user does not have to write his username again. Is that possible? The property mapping of smartsheet for the email address is : emailaddress and i have it as return request.user.email