Formatting: Is there a way to enter "empty" lines respectively gaps of different sizes?

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I like to use the option of captions in different sizes (# to #####).
The gap between the headlines and the sections is always the same. So I'd like to add some "empty lines" here and then to make clear what headlines and blocks belong together.
But it seems like "double gaps" are ignored and the distances between lines are always the same (see attached files).

input	output

Is it intentional that "double" newlines are ignored? Is there a way/workaround to add a "bigger" gap between two lines?

Start by reproducing the attached input and rendered output in the Nextcloud Notes Android app, focusing on how consecutive blank lines between headings and sections are handled. Done means the issue's expected behavior for differently sized gaps is decided and implemented or a documented workaround is provided, with the result verified against the example.