How to change border top radius of chat bubbles

[mogulist]

I was able to change border bottom radius of chat bubbles by setting borderRadiusL and borderRadiusS in messageSimple.container:

export const theme: DeepPartial<Theme> = {
    messageSimple: {
        content: {
            container: {
                borderRadiusL: 6,
                borderRadiusS: 6,
            },
           . . .
};

As shown below, border top radius are not changed:

I couldn't find any property to change border top radius of chat bubbles.

[treyshedrick]

Following up on this. Were you able to figure this out? @mogulist