Rgb color in BABYLON.GUI.TextBlock

TextBlock only accept color names.
I would like to know if it is possible to put the value of as in hex as in html

Hey @darkbit!

Welcome to the Babylon family!

Yes you can use hex color values by setting the value to the hex as a string like this:
text1.color = "#0394fc";

Check out this playground for an example:

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Welcome to the forum!
While the post of @PirateJC actually is the solution of your question regarding TextBlock, for materials colors etc. you may use, for example, RGB from HEX
sphereMat.diffuseColor = new BABYLON.Color3.fromhexstring("#ffffff");
or RGBA from HEX
selectedMaterial.diffuseColor=new BABYLON.Color4.fromhexstring("#FD6304FF");

See also API docs