Using the browser on my smartphone, I cannot activate the popup for the Cloze word, only for the other words in the sentence: one tap places the cursor inside the word and two taps activate the zoom. I also find that although I can select two or more consecutive words, I cannot bring up the popup for the entire selection: it only comes up for the word I click.
I wonder if yet another button is needed.
The screenshot is from Vivaldi on Android 10.