Thanks for reporting this issue. The APIs supported by officejs are all in this document: https://learn.microsoft.com/en-us/javascript/api/excel?view=excel-js-preview. Please check it as you needed.
If this API(https://learn.microsoft.com/en-us/javascript/api/excel/excel.chartmapoptions?view=excel-js-preview) can't unblock your scenario, we would like to suggest you go to https://techcommunity.microsoft.com/t5/microsoft-365-developer-platform/idb-p/Microsoft365DeveloperPlatform and see if your question has already been asked or ask a new question. Feature requests on it are considered when we go through our planning process.