Is it possible to use two base searches in one post-processing search?

I have a dashboard similar to this one:

Multiple Base Searches

Hosthosthosttrue

index=_internal | eval count = 1 | timechart per_minute(count) as rate by host-10m@m@m index=_internal | stats count as count by host | addinfo | eval rate=count * 60 / (info_max_time - info_min_time) | fields host rate-20m@m-10m@m where host=$selectedHost|s$ | fields rate fields _time $selectedHost|s$ | eval baseline = 123columnbaseline

Instead of the hard-coded value "123" in the search "Timechart with baseline overlay" i want to use the "rate" field which is calculated in the "statsBase" search. I could not find anything suitable in the documentation. Is this even possible? As I workaround I tried to use the `loadjob` command to access the result of the second base search as shown in the code below:

Multiple Base Searches

Hosthosthosttrue

index=_internal | eval count = 1 | timechart per_minute(count) as rate by host-10m@m@m index=_internal | stats count as count by host | addinfo | eval rate=count * 60 / (info_max_time - info_min_time) | fields host rate-20m@m-10m@m$job.sid$ where host=$selectedHost|s$ | fields rate fields _time $selectedHost|s$ | eval [ | loadjob $sid|s$ | where host=$selectedHost|s$ | return baseline=rate ]columnbaseline

When I open the panel in search using the magnifier icon, the generated search works perfectly however. I'm on Splunk enterprise 6.3.1 by the way.