Finding solution this morning and figure out this can be pretty handy.

1. Run command below:

   ./bin/standalone.sh \
   -Dkeycloak.migration.action=export \
   -Dkeycloak.migration.provider=singleFile \
   -Dkeycloak.migration.file=keycloak-backup.json
   

   In my case, i override few parameter as my keycloak is running.

   ./bin/standalone.sh -P ./standalone/configuration/standalone.properties \
   -Djboss.http.port=8090 \
   -Djboss.https.port=8098 \
   -Djboss.management.http.port=8990 \
   -Djboss.management.https.port=8993 \
   -Dkeycloak.migration.action=export \
   -Dkeycloak.migration.provider=singleFile \
   -Dkeycloak.migration.file=keycloak-backup.json

    

2. Once you get the backup file, you can selectively import from your admin console.
   

source from: https://www.keycloak.org/docs/latest/server_admin/index.html#_export_import