Specify username in SAML AuthnRequest

We are building a saml integration with Okta as service provider.
We are using passport-saml on our side.
I wanted to know how I can pass the username in the SAML AuthnRequest to okta?
I need the username in the okta login screen to be populated based on the parameter I send to the AuthnRequest.

<?xml version="1.0"?>
<samlp:AuthnRequest AssertionConsumerServiceURL="http://localhost:30000/saml/consume" Destination="https://dev-3135214.okta.com/app/dev-3135214_mysamlapp_1/exk2wb8hqSMrxmIVh5d6/sso/saml" ID="_475a864680b9f8743f70" IssueInstant="2021-06-07T04:51:10.630Z" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Version="2.0" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
	<saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exk2wb8hqSMrxmIVh5d6</saml:Issuer>
	<samlp:NameIDPolicy AllowCreate="true" Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"/>
	<samlp:RequestedAuthnContext Comparison="exact" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
		<saml:AuthnContextClassRef xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
	</samlp:RequestedAuthnContext>
	<saml:Subject xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">
		<NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">test@example.com</NameID>
	</saml:Subject>
</samlp:AuthnRequest>

I am sending the SAML request in this format. Note the Subject parameter in XML. I dont see the okta login screen use this parameter when sent in the SAML request.

Hello! These questions are better answered by our tech support team who deal with SAML. Can you ask the question here instead?

https://support.okta.com/help/s/questions?language=en_US