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The phrase "filling in" is correct and usable in written English.
You can use it to describe the act of completing a form, questionnaire or blank space in a document. For example: "Please make sure to fill in all required fields on the form before you submit it."
Dictionary
filling in
verb
Present participle of fill in
Exact(59)
"We are filling in the mosaic".
"I'm filling in for him.
Place filling in pie shell.
(Mr. Kulik was filling in for Mr. Taylor).
Paul Theroux on filling in the gaps.
The place is filling in nicely.
I hate filling in application forms online.
Kenneth Chang is filling in this week.
Tell us by filling in our questionnaire.
Milledge has been filling in for Beltrán.
Similar(1)
The interviewers conducted filling-in of questionnaires.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com