How to get specific value from last event splunk

[mishaaaaaaaaaa]

Hi splunk comunity!

How can i get specific value from latest event and earliest event during the period i set?

I need to find latest event and then get sum of specific field value from this latest event snd to do the same for earliest event then i want to calculate difference between them.

I cant do something like this becouse of feature of my event, i have accumulating value

| stats sum(value) as sumValue by _time
| stats earliest(sumValue) as earliestVal latest(sumValue) as latestVal
| eval dif=latestVal-earliestVal 

in this case i got 1+2+3+4... it wil be sequence

And i cant do like this, because i have tag in my value and i will get max tagValue and min tagValue

| stats max(value) as maxVal min(value) as minVal
| eval dif = maxVal-minVal

my event:

 value: { [-] 
         name: nameValue
         tags: [ [-] 
           { [-] 
             sampleCount: 11590 
             tagValues: [ [-] 
               { [-] 
                 tagKey: tagKey1 
                 tagName: tagName1
                 tagValue: tagValue1 
               } 
             ] 
             value: 0 
           } 
           { [-] 
             sampleCount: 11614 
             tagValues: [ [-] 
               { [-] 
                 tagKey: tagKey2 
                 tagName: tagName2
                 tagValue: tagValue2 
               } 
             ] 
             value: 0 
           } 
           { [-] 
             sampleCount: 10872 
             tagValues: [ [-] 
               { [-] 
                 tagKey: tagKey3 
                 tagName: tagName3
                 tagValue: tagValue3 
               } 
             ] 
             value: 0 
           } 
         ] 
       }