If I do the on the for the :host element
card_mod:
style: |
:host {
--card-mod-icon: mdi:fan-speed-1
}
I am getting this

but when I try to use DOM path (even obtained via the card-mod-helper:
"body>home-assistant$home-assistant-main$ha-drawer>partial-panel-resolver>ha-panel-lovelace$hui-root$#view>hui-view>hui-masonry-view$#columns>div:nth-child(3)>hui-card>hui-vertical-stack-card$#root>hui-card:nth-child(5)>hui-tile-card$ha-card>ha-tile-container>hui-card-features$hui-card-feature$hui-fan-preset-modes-card-feature$ha-control-select$#option-toggle\\fan>div>ha-attribute-icon"
and use with this config:
card_mod:
style:
hui-card-features$hui-card-feature$hui-fan-preset-modes-card-feature$ha-control-select$: |
#option-toggle\\fan>div>ha-attribute-icon {
--card-mod-icon: mdi:fan-speed-1
}
nothing works. No matter what I do to this path. Even though this guy was in the same situation and got it
working