Hi Ira Korabelnikov,
Thanks for reaching out to Microsoft!
As per document, Get RangeFormat
- Retrieve the properties and relationships of rangeformat object.A format object encapsulating the range's font, fill, borders, alignment, and other properties.
Using Graph API, to get range fill
GET https://graph.microsoft.com/v1.0/me/drive/items/{id}/workbook/worksheets/{id|name}/range(address='<address>')/format/fill
GET https://graph.microsoft.com/v1.0/me/drive/items/{id}/workbook/worksheets/{id|name}/range(address='<address>')/format/font
Hope this helps.
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