@azuki-addict You can use the HTML block, which accepts HTML. Notice that it is subject to the "safe HTML" Plone rules, so you may need to configure some of this stuff in the Plone Classic Control panel.
Probably not. The HTML block is seen as an escape hatch in Volto, so in principle it won't get a lot of attention. All features in Volto need a "champion", so if you care about this feature, please contribute it, it will be more then welcome.