How to transform number based on conditions

Copper Contributor
Hello,
 
Description: We have availability tests configured for specific URLs in app insights. Results are stored in log analytics.
 
Objective: I want to create custom dashboard based on average duration time.
 
Issue: duration time shows as numbers, for example 300ms is 300.0 and 17s 300ms shows as 17,300.0 . I want to transform/change the number to be shown as 17s300ms or 300ms
 
How can I do that?
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