Accessing form control values within Excel workbook

My excel workbook is having form containing dropdowns, checkboxes, etc. Which API should I use to access the user selected values within those controls (e.g. whether the checkbox is checked or not, etc.)?

Any help in this regard is greatly appreciated.

Dear hulahoop,

Laurence is temperarily out and he will be back this weekend.

Thanks for your patience.

Dear hulahoop,

Thanks for your consideration.
Sorry, currently this feature is not supported.Could you tell me your expected availalibilty time? I will investigate this feature and place it in my feature work plan.