Calculation number of islands of a particular lake, or number of enclosed inner polygon

How to calculate number of islands of a particular lake according to current OSM data, like Lac Simard

Some large lakes may composed of thousands islands, so it is impossible to count one by one

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/calculation-number-of-islands-of-a-particular-lake-or-number-of-enclosed-inner-polygon/107281