to understand more, please can you describe your show command (perhaps write full show command for your example)?
In case you mean something like this:
show root systemmonitor CPUMonitorHigh cpu-usage , then you would receive data provider get_elem callback directly for leaf cpu-usage
If you mean something like show root systemmonitor | include CPUMonitorHigh, then you will get all list elements (lines) which contains CPUMonitorHigh. The filtering is done on CLI level, so in the C callback you will get request for all data (won’t be able to figure out the filter after include). You can test it with simple data provider implementation (see examples intro\5-c_stats)
As this is more detailed CLI question (CLI filtering), it is better to use support and open RT ticket for it.