Three feel

I'm trying to create a score with three sets of two eight notes to add up to three beats. However, under the three sets of eight notes, I want to add a bracket with a 3 in the center so that it is played over two beats. Mind you, it is not a straight triplet feel, nor are the eight notes placed in a grouping of three. I'm not exactly sure what this is called, but I've included an example of it from another score. Anyway, I can't figure out how to do it in Musescore 4. Any ideas? See attached example

Thank you for your help. I'm a newbie at this.