Concatenate String in a loop

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Hello I have a list, for example ID, Description. I need to loop that list and return of IDs.  for example [ {"description":"D6","id":31}, {"description":"D7","id":32} ] reply [31,32]   I tried the following microflow, but could not proceed. Please advise the way forward. Thank you
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In ‘Change variable AssetIDs’ set the new value to $AssetIDs +’,’ +$IteratorMasterData

After the loop remove the last ‘,’ by adding another ‘Change variable AssetIDs’ and now set the new value to substring($AssetIDs, 0,length($AssetIDs)-1)

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