spell check /proofread Gutenberg blocks

Hi I am working on a new site, and have installed the Gutenberg plugin, because that way the editor will be used to whats to come soon.
But she would really love to do a spell / grammar check.
Grammarly seems to conflict terribly with the Gutenberg plugin, so I thought I’d try the Jetpack option.
But I can’t get it to work, I see no option to check the text in the Gutenberg blocks.
If I insert a Classic block I get the button to check, but it seems to do nothing…

Am I doing something wrong?
Can (or will) the spell and grammar check work with Gutenberg blocks?

Hope you can answer!!