Block that loads function

I created an block in the database and I want to link it to an function.
In the "function" field (database), I placed PersonalAssistent that must load the content which is loaded in the function PersonalAssistent (created in the template functions file).

The block is visible in the pagebuilder, but isn't showing on the webpage.

What do I do wrong?

If I change the function to getBlockCode_PersonalAssistent() and place it inside BxDolPageView.php then it shows on the website.

Is there a way to link to the funtion in the template functions file (BxTemplFunctions.php), so in case of an update the function is always in that templates file?

In this case it's better to use PHP code block and insert the following code there:

return $GLOBALS['oFunctions']->personalAssistent();