Need to make some design decision based on Kafka and Cassandra

Question

In our use case we want to show some charts, metrices and grid based on Kafka topics data.( All Topics are already loaded with Json data from different systems )

We are planning to use Kafka connect and will sync topics data to Cassandra database.

Based on some trigger like any new data in Kafka topic will re-load UI and read same data from Cassandra (Via Dot Net core APIs) and display it on UI.

So is it good idea to use Kafka connect and sync data to Cassandra and query on Cassandra to load UI data Realtime.

Note : Reading data directly from Kafka topics and display on UI using Dot net Kafka consumer is very slow as in our use case we need to query different topics.

Kindly provide suggestions on same.