Lovelace map card in HA - INFO

[pszafer]

Hello,
Not an issue of Valetudo, but maybe here is someone who knows hot to avoid CORB (and I guess later CORS).
I tried to write lovelace card with map as follows:

- type: custom: valetudo-map-card
  robot_address: <IP>

I thought that it would be the best as all of the drawing would go to client browser.
But then CORB error occured.
Seems that Express library doesn't allow to change content-type header expressjs/express#3961
According to this - cakephp/cakephp#13156 Chrome won't allow to download json if Contenty-type header line doesn't end with *json.

Our content type looks like:

Content-Type: application/json; charset=utf-8

Any advice?