Rest API Call in AEM forms

Hi All,

We have a Rest API implementation where we are calling a Bank API by passing Oauth token to the Bank API.

The balance details has to be populated from the API response and needs to be shown on the front end.

We want to implement the same in AEM forms.

Easier Approach Solution 1:

1)Create a form Element and have a Id attached to it.

2)Create a Client Library JS code where we will have a ajax call to our Servlet and Our Servlet will have the HTTPClient Code to consume the APi and we can send the details to the front end and our front end will display details and we can show that using javascript.

But the concern  with this approach we are not using any core AEM forms Functionality here and not levaraging any core aem forms capability here.

Need Suggestions how we can do this type of implementation levaraging AEM forms and use more of authoring capability of aem forms.

thanks in advance