Can I run the below mstats command as 1 command?

[robertlynch2020]

hi

Can I make the below mstats into one SPL? Below there are 2.

I am pulling data from the same metric. I have a "where" in one.  

| mstats sum("mx.http.server.requests") as total WHERE "index"="murex_metrics" mx.env="feature/monitoring/nfr/new-log-metrics-19"
| appendcols 
    [ mstats sum("mx.http.server.requests") as declined WHERE "index"="murex_metrics" mx.env="feature/monitoring/nfr/new-log-metrics-19" status.code>=400
	 | appendpipe 
        [ stats count 
        | eval declined=0 
        | where count=0 
        | table declined ]] 
| eval percent_declined=100 * declined / total 
| table percent_declined

I looked at this question and I don't think I can use "stats style eval aggr functions" 

| stats count(eval(ip=="37.25.139.34")) 

https://community.splunk.com/t5/Splunk-Search/How-to-use-eval-with-mstats/td-p/563751

So perhaps I need to run 2 mstats, I was hoping I could just run 1. However i think it is not possible for what i am trying to do.

Rob