Heos and Tunein

Hi Short Question,

i use Alexa / Google / Siri and Homey

I can tell Alexa "Alexa play “Radiosender Name” on "Name of my Heos speaker.

I will do a flow:
Press button “Agara switch” 1x make light on and play Radio “Sender” on “Heos” Speaker

I can do:
Press Button and Play on Speaker. But then it plays the last source.

Is is there any app do define the source for the Radio “Tunein” in the flow?