unfortunately the UI dashboard does not support importing yaml code, I would suggest making a feature request on the Home Assistant Community forums.
I have been reworking the code to be a standalone template for button-card, that does rely on Minimalist UI, so if you can code dashboards In yaml mode, I could supply you with beta version of the templates.
you can use mushroom cards in yaml mode dashboards.
unfortunately the UI dashboard does not support importing yaml code, I would suggest making a feature request on the Home Assistant Community forums.
I have been reworking the code to be a standalone template for button-card, that does rely on Minimalist UI, so if you can code dashboards In yaml mode, I could supply you with beta version of the templates.
you can use mushroom cards in yaml mode dashboards.