You can override _raw and wipe out the old fields
... | rename empty as _raw | rename _raw as yourfield | extract pairdelim="[\r\n]+" kvdelim=":"
a little more complicated is to keep the origraw and replace at end
... | eval origraw = _raw | rename empty as _raw | rename _raw as yourfield | extract pairdelim="[\r\n]+" kvdelim=":" | rename origraw as _raw
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