Long press on keyboard supported in macOS?

Is there a way to use the “long press” feature in Gimp on a macOS system, so I can get the option where it shows me the letter with all the options that include diacritical marks?
(example: long pressing “a” gives you à, á, â, ä, æ, ã, å and ā; and you select the number below whichever one you want to insert into your graphic).

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That will be a great tool if you ever get it working with Gimp. A quick search came up with this Compose Key on macOS | Alexander Goller

There is a comment there about that long key press, not sure where ctrl+cmd+space comes in. Maybe you could ask the author of that article.

As an alternative using compose key (with linux and Gimp 2.10), which saves having to copy-paste from a character map. You do have to remember key sequences. Examples: degree sign: compose then o then o = ° or compose then e then ’ = é This does work with the Gimp text tool.

Hope you find a solution.