Vue modal access to input field

as per a prior request i posted the project to github

anyhow, the problem is that I don’t understand the vue data model

there are 3 separate places data is defined

props
data()
and setup()

apparently NONE of them talk to each other

i pass in parm as use it in the

<ion-input>{{parm}}</ion-input> 

that works…
but the parm is not updated by user editing

i add v-model=??? some data item… but that item overwrites the value of the property

but I don’t know which one of the data containers to define the variable for v-model in
and how to address it

then when the button on the modal is pressed i want the current value of the input field
which v-model (like angular) should give me… but unless I type in the field it doesn’t pass back the initial value…
(and i shouldn’t have to manually place the parm value into the data element for the v-model)

so, I can;t tell if I have a programming problem,
and data problem
or a bug
or a limitation in this release (as I see there was a problem with ion-input and v-model before