Change text size to fit container

Not a flexible solution (especially if the repeating group isn’t fixed width), but you could apply conditional breakpoints using the character count. (Ie. when Title’s:number of characters is ≥ n, then font size is X. Then repeat this through several character count breakpoints).

I’d recommend running a few simulations to figure out what the exact character lengths are that correspond to your repeating group’s fixed width and where to set the breakpoints.

Would look something like this…