Start driving without a route plan, then navigate to an intermediate destination and still record the entire route in one go?

Hi guys, maybe someone can help me.

The scenario is as stated in the subject line: I drive off first without having planned a route and record - no problem, that works. On the way I would like to be navigated to the nearest supermarket or similar. How can I achieve this without having to interrupt my current recording? For example, I could also do the navigation via Komoot or another app by importing a GPX file, because that's too fiddly on the Edge 2. But I just can't get my track of the entire tour to continue to be recorded in one piece.

Translated with DeepL.com (free version)