use below sample command:
php bin/magento setup:config:set --cache-backend=redis --cache-backend-redis-server=xxxxxxxxxxx --cache-backend-redis-db=0
use below sample command:
php bin/magento setup:config:set --page-cache=redis --page-cache-redis-server=xxxxxxxxxxx --page-cache-redis-db=1
Both cache could be save on same redis server but it will use different databases 0 and 1
Note: For local redis cache, use 127.0.0.1