Append User PHP function to String format dropdown?

This setting allows us to select various php formating functions for our View Tags:

Fields->View Tag->Format

The help guide explains that we can also use our own Custom function for String formats:

Fields->View Tag->Format->String->String function->my_global_php_function({value}, time(), $whatever)

If I am using my_global_php_function on many fields, it would be very handy if I could have it populate in the dropdown with all of the inbuilt String functions.

Q. Is it possible to somehow append our own global functions to the String format dropdown?

[I know we could make a Custom View Tag and use the Custom View Tag dropdown instead, but still interested in seeing if above is possible].

I don’t find anything in the help file that you can add your own functions in that setting to select.

From PHP Help menu regarding Format String → String function in View Tag (under Field Setup topic):

If the string function name is not listed in the dropdown, you can enter your own function name.

jrock wrote:

Q. Is it possible to somehow append our own global functions to the String format dropdown?

You may manually type your own function name but not selectable from the dropdown.