Get form pieces and available options

Hi,
is there a way to get, from outside (ie. another plugin), the fields and the option values (for checkbox and radio) of a dedicated form.
For explain, i work on a plugin which will store datas into database (that’s ok) and then transform some values into a dedicated process. At this step, i need to be able to modify for example a value choosen by user, for example from a radio input he choosed “Familiy One” but i need to update to “Familiy Two”. But for that, i need to recover all the checkbox options available in the form and then display them in my own UI plugin screen.
Thanks.