maxTextSize in init directive doesn't seem to be helping

[SCWells72]

I apologize if this is an ignorant or well-answered question, but I haven't been able to find quite the same variant of it that I'll be asking here.

I currently use Mermaid in a way that I'm a few layers of indirection away from being able to control its behavior via command-line or even JavaScript. Basically all I can do is generate a .mermaid file and hand it off to the rendering environment.

If you're truly curious, I've effectively added Mermaid sequence diagram generation to a JetBrains IDE plugin, and the resulting .mermaid file is rendered by the JetBrains Mermaid plugin via a JCEF-embedded browser. Like I said...several layers of indirection.

I've generated some diagrams complex enough that they result in Maximum text size in diagram exceeded. I've tried to add maxTextSize: <higherValue> to the init directive, but that doesn't seem to do anything, e.g.:

%%{
    init: {
        'theme': 'default',
        'maxTextSize': 100000,
        'flowchart': {
            'useMaxWidth': true
        }
    }
}%%

Should what I'm doing above work, at least assuming that nothing else is already explicitly setting its own value for maxTextSize? I add that qualification because I'm wondering if perhaps the Mermaid plugin is adding something like the following in the hosting content:

        mermaid.initialize({
            maxTextSize: 150000
        });

and that's overriding the value I'm trying to set in the directive.

Any insights that anyone might have to share are greatly appreciated!