Create private key in TPM and use it without password prompt

[raihav]

Expected Behavior
I want to start openssl server with tpm2tss engine that uses a private key stored in TPM without prompt for password.
Hint: The prompt should have been supressed by: Enable emptyAuth detection for noda persistent keys #55
Please can you tell me how I shall create a key to avoid password prompt by tpm2tss engine?

Test
I have created the key with NODA and stored in TPM with handle 0x81010101
tpm2_create -C primary.ctx -G rsa -u key.pub -r key.priv -a "decrypt|sign|fixedtpm|fixedparent|sensitivedataorigin|userwithauth|noda"

With tpm2tss engine, the server starts and asks for password.
openssl s_server -cert secrets/localhost.crt -key 0x81010101 -keyform engine -engine tpm2tss -accept 4443

For comparison with tpm2 provider, the server starts without prompt.
openssl s_server -provider tpm2 -provider default -propquery ?provider=tpm2 -accept 4443 -www -key handle:0x81010101 -cert secrets/localhost.crt

Context
gRPC supports OpenSSL engine only and the password prompt is not implemented in gRPC code.