How to set up conditional jq transform?

I need to transform a JSON, which can either have 1 value or 2. So it can be:

{"form":{"textinput1":"aaa"},"params":{"context":""}}

or

{"form":{"textinput1":"aaa"},"params":{"context": "something"}}

And the output I need is this:

{"input": {"text": "aaa"}}

or

{"input": {"text": "aaa"},"context": "something"}}

JQ Transform would be:

{"input": {"text": .form.textinput1}}

or

{"input": {"text": .form.textinput1},"context":.params.context}

But how to merge these two into a condition?