[Custom Components] Select component Customization to add values (Data Source Values) in runtime of submitting form
I have a requirement on select components as We have select component with options/Data Source Values (Ex: opt1, opt2, opt3) Now I'm going to submit the form in formio tag, But unfortunately opt4 is not in the select component list values/Data Source Values. So I have to provide Add button (+) at select component like below to add options that missed at the time of submission even if the values getting from the RestApi/URl for those also i have to add missed Data Source Values

The use-case is unclear to me. Are you needing the "add" button for a user to insert their own option? Are you needing to force another API call to update the options? Where does "opt4" come from?
Thank you for your contribution. As this issue has been inactive for over 90 days, I will close it for now. If you wish to reopen the issue, please respond and we can resume the triage process.