I agree. Please let me post the answer from my colleague in the other post here as well:
"Currently our expressions don't support the required syntax. However, you can achieve the same result with a simple user function:
public static object SplitArray(string values)
Then you can use the above user function in the reports expressions as shown in the following sample:
Value: =SplitArray("1, 6, 7, 88, 22")
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