nodemanager TLS version

I am trying to address a security vulnerability for the nodemanager of the 12c fusion middleware server environment (12.2.1.3). The remote service encrypts traffic using an older version of TLS. The solution is to enable support for TLS 1.2 and 1.3 and disable support for TLS 1.0. To address this issue, I added a line to startNodeManager.sh script as follows and restarted FMW server:

JAVA_OPTIONS="-Dweblogic.security.SSL.enableJSSE=true -Dweblogic.security.SSL.protocolVersion=TLSv1.2 ${JAVA_OPTIONS}"

export JAVA_OPTIONS

The version of JDK is 1.8.0_191.

But the above change did not resolve the issue. The 12c FMW server is using demoidentity Keystore at the moment. Is TLS support anyway linked to the demo Keystore? How can I address this issue?