Hi @Janani,
Yes, it is possible in Iparams.html as well,
you can use data-bind="product.api_key"
/ data-bind="product.domain"
to prepopulate it
eg:
<input type="text" name="api_key" data-bind="product.api_key">
<input type="text" name="domain" data-bind="product.domain">
Hope it helps
Thanks