@Kudratilla - could you apply the below to a Button control,
UpdateContext({ctxReset: !ctxReset});
and then apply the below onto the Reset property of that field:
ctxReset
If you want the field to be blank, apply the below to the Default property of the DataCard (not the DataCardValue)
If(
ctxReset,
Blank(),
ThisItem.'Your Field'
)
Depending on how you're populating the Form, (e.g. via a Gallery selection), you may also want to include the below on the OnSelect property of the Gallery:
UpdateContext({ctxReset: false});