Read Only Grid filter data

Certified Senior Developer

I have a read only grid with a record type as source, I have three columns that has dynamic values. Meaning, I am using 4 or 5 record fields and get average these are custom fields.

value: recordType!field1+recordType!field3+recordType!field3 / 3          --Its a numeric field lets say field name is "Avg value"

then I have one drop down that suppose to filter the values in readonly grid based on slection.

If I select the value ">1" from drop down readonly grid should filtered and show only records have "Avg value" column >=1

I am not able to use queryFilter as I don't have appropriate value for "Field"

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