Hi @Adrian Germeck,
I believe you should be able to hook into the 'setWizard()' javascript API to make an ajax call once the form has been rendered. Try listening to the 'post-render' event and then making the REST request from there. Alternatively, you may try to make an AJAX request and call setWizard after you've received the data, passing it in a pre-render event, so you can handle your ajax-received data via a context provider on the server side (in a soy template).
Checkout the Blueprint wizard javascript API for more information. https://developer.atlassian.com/server/confluence/javascript-api-for-blueprint-wizards/
Vivian
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