how to get two diffrenet metrics in single json

[NamanGajjar26]

i am using host-metrics,k8s_cluster,kubeletstats get metrics from opentelemetry and send to opensearch
there are get two different metrics get in my index first is node_cpu_usage and second is node_allocated_cpu
i want node_allocated_cpu value get in node_cpu_usage as new field name (total_cpu_size)
below is node_cpu_usage

below image is node_allocated_cpu