I would like to know if it is possible to set a default Overlay color for the Core Cover block using theme.json, so that when a new Cover block is added, that Overlay color is pre-set rather than having no color selected.
I know you can create a custom palette for the Cover block like so:
"settings": {
"blocks": {
"core/cover": {
"color": {
"palette": [
{
"color": "#ffffff",
"name": "White",
"slug": "white"
}
]
}
}
}
}
But this just restricts the color palette - it does not set a color when a new Cover block is added to the Editor.