Post Json with mapping

How can i insert a json and directly have new values mapped in correct format ?
e.g. the field "amount" is not yet in my index and hence also not yet mapped. My index is having a lot of different values with a mapping already and i dont want to completely map all values new.
How can i insert the document with telling how to map ? I want this json inserted with location as text and amount as numeric:

POST index/_doc
"location": "Germany",
"amount": "15",

You just ingest data and Elasticseach will do the dynamic mapping:

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