How to retrieve JWT Token from Oracle Fusion using parameter

Summary:

I have appended the following at the end of the vbcs page url when integrating vbcs page into oracle fusion:
?jwt=#{applCoreSecuredToken.trustToken}

Expecting to retrieve jwt token when the application is opened. But token is not displayed.

What are the pre-requisites for jwt token to be retrieved.
or how else can we access the token.