You could create a virtual device and set the capabilityValue through HomeyScript.
I dont think there is any way to realise this with existing devices, since it would need a capability that you can set without it doing something.
Is the option for a seperate (virtual) device an option for you? If so i can add it to my Device Capability App (implementing it now, will be in test in a few moments).
I have just put Device Capabilities 1.5.0 to Test Device Capabilities | Homey.
You can create a Virtual Device, set how many fields you need in the settings of the device and then set the value through flowcards:
Meaning, yes, you can use this to show the status of a flow, but i guess you have to do that numerical.
I, indeed, cannot make the Text available in Small Icon/Mobile form.
btw, adding Button option right now, so the button can be used for flows and there responses.
Added: Buttons (can be set through settings) can be added, so you can use it as a push button for flows.
Or selecting anothere zone/room and go back will also make it update.
I will send in a ticket to athom support. But since i am using a nondescript function/ hack to achieve the statustext, im not sure the will hurry to fix it