JetFormBuilder Call Hook action

jfb-call-hook.php

<?php

add_action( 'jet-form-builder/custom-action/test-hook', function( $request, $action_handler ) {
	
	//get value of field field1
	$value = $request['field1'];
	
	//or using jet_fb_context()->resolve_request()
	$value = jet_fb_context()->resolve_request()['field1'];
	
	//return an error if field1 is less than 10
	if ( isset( $request['field1'] ) && ( int ) $request['field1'] < 10 ) {
		throw new \Jet_Form_Builder\Exceptions\Action_Exception( 'field1 is less than 10');
	}
	
	//set field1 value to 20
	jet_fb_context()->update_request( 20, 'field1' );
	
	//Update value inside specific row in the repeater
	//Where: 0 - first row in th repeater
	jet_fb_context()->update_request( 'repeater_name.0.field_name', 'new inner field value' );
	
	// or this way
	jet_fb_context()->update_request( array( 'repeater_name', 0, 'field_name' ), 'new inner field value' );

	//Update specific field in each row of repeater
	foreach ( jet_fb_context()->iterate_inner( 'repeater_name' ) as $context ) {
	   $context->update_request( 'field_name', 'new inner field value' );
	}
	
	//get ID of the post, created by "Insert/Update Post" action
	$inserted_post_id = $request['inserted_post_id'];
	
	//check what data comes to hook
	//jet_fb_context()->resolve_request() to get request with the changes
	//form execution will be interruppted, though you will be able to check what may be the reason of the hook not working as intended
	$request_from_context = jet_fb_context()->resolve_request();
	var_dump( $request, $request_from_context );exit;
	
}, 0, 2 );

Line 17:
jet_fb_context()->update_request( 20, 'field1' );

Line 21:
jet_fb_context()->update_request( 'repeater_name.0.field_name', 'new inner field value' );

So, which is correct, 1st parameter is the field name and 2nd parameter is the new field value ?

Is there any documentation on why or how to use the $action_handler object? This custom hook feature looks like it could be very useful.

I have a custom hook called check_email in JetFormBuilder. This hook checks whether an email exists in the database.

Expected Behavior:
If the email exists, the hook should return true (or "approved"), allowing the form to proceed with the next action.

If the email does not exist, the hook should return false (or "rejected"), preventing further actions from executing.

Issue:
I am unsure how to make JetFormBuilder process actions conditionally based on my hook’s return value. How can I return "approve" or "reject" and use this result to control form execution?

Any guidance would be appreciated!

Line 17: jet_fb_context()->update_request( 20, 'field1' );

Line 21: jet_fb_context()->update_request( 'repeater_name.0.field_name', 'new inner field value' );

So, which is correct, 1st parameter is the field name and 2nd parameter is the new field value ?

Look, i have used for one of my custom functionality:

// Set the new path in JetFormBuilder dynamically
jet_fb_context()->update_request($converted_url, 'converted_video_upload');

It's working very well so the 1st parameter is "Field Value" and 2nd parameter is "Field Name".