It is possible to create custom element with 2 blocks inside then do your business. Please see the Address and DateTime element in samples project here: https://github.com/episerver/EPiServer.Forms.Samples

Note that you might need to override the method getCustomElementValue to return data from your custom element in format you want.

Hope this help.

Thanks, that's a lot help, I dont know how I would come to this alone. However, getCustomElementValue doesn't do exactly what I want. I want that every field inside block sends separately. For example, it's working like this:

{Address:{Country: USA, City: NY}}. And I need this:

{Country: USA, City: NY}.

This is why I tried to put two form blocks inside another. Is there a workaround?

I've got the same problem. I'm having to do my address as one field, but I'd really like to save each part of the address as a separate field when the form is sent.

You can return your data in any format you want. You can override the method GetSubmittedValue() in your custom element to do that. Please see that method on the file AddressElementBlocks.cs.

Like I said, this method is responsible for "{Country: USA, City:NY}" but when form is submitted, the result is "{Address{Country:USA, City: NY}}.

I mean, instead of using the sample serialize object, you can modify code to serialize the object yourself then you have full controlled how the returned object should look like...

Not the full controlled. I dont need "address" part in response

The "Address" is your element's name and its value is a json object in the right part. Let say you have 2 elements: Address and Email, you need something to know which data belong to the Address and which belong to the Email. Right? If you only need to send the value WITHOUT element name, you can create your custom actor then do yourself. The default CallWebhookAfterSubmissionActor can sent in JSON format or "name=value" format.