Well, there’s actually a beta that maybe might interest you @Asaf_Chip 
The Full-Page Embeds, when launched might not fulfil all your needs but while testing, I was able to interact with the site you linked in your first post and play the radar animation .
Also, I’m not sure if this might help you here but have you tried to use Embed() within a canvas formula ?
Something like :
Embed("https://www.meteo.cat/observacions/radar", force: true)
Neither will help you to gather datas directly from the site into Coda but it might help you to consult/view the site 
.
This is just a thought