'Convert a string pair of coordinates to geomtery data type in MongoDB

I have a column in a MongoDB collection with location stored as string pair values: geometry:"POINT (72.548355 23.042458)"

I need to create a geometry field which works with MongoDB's spatial queries. Something which is in this format:

"geometry": { "type": "Point", "coordinates": [72.548355, 23.042458] },

Please help. I need to run this for billions of entries in the collection. So an optimized solution will be extremely helpful. Thanks in advance

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