I tested the following sample: https://github.com/azure-ad-b2c/samples/tree/master/policies/pwd-reset-via-email-or-phone
and I can see below result: 
However, I want to add the TOTP option to this page. I tried using the following sample but it is not giving me the expected result. Any inputs?
Please note that, you can select only one authentication method while enabling MFA.
In your scenario, you can select either TOTP or SMS/call as authentication method but not both.
I tried to reproduce the same in my environment and got the below results:
When I selected authentication method as SMS or phone call, user is prompted for MFA like below:
To enable TOTP option, update the user flow by changing authentication method like below:
When the user ran the user flow, it prompted for MFA to scan QR code like below:
After clicking Continue, they will get OTP in their Microsoft Authenticator app where they need to enter that code here:
Like this, you can enable TOTP as MFA method. But you cannot add this with SMS or Phone call as you can chose only one authentication method.
keep in mind that user flows has very limited options to customize, therefore this one that you want is not available. You need a custom policy for that, more complicated, yes but there are plenty options to customize and plenty workarounds if Azure doesn't offer you what you need.
