creating a template (class) for smart diagram (bubble diagram)

I’m trying to build a template for a bubble diagram, since I don’t know in advance how many bubbles need to be added I’m trying to do it using foreach.

I suspect foreach does not expand the way I think it would because instead of multiple bubbles I get 1 bubble with all the text.

newcommandaddbubbles[1]{
    foreach x in {#1}{textbf{x}, newline}
}

% Command for printing bubble
newcommandflexbubblediag[1]{
    renewcommand{flexbubblediag}{
        smartdiagram[bubble diagram]{
            addbubbles{#1}
        }
    }
}

in my .tex I use to

flexbubblediag{{bubble1},{bubble2}}