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"filled in as" is correct and usable in written English.
It can be used when wanting to indicate a replacement or substitute for a person or object. Example: Since Sam was out sick, his assistant had to fill in as his replacement.
Exact(58)
If it is filled in, as is ordinarily the case, the resulting structure is termed a spandrel wall.
Tech industry analysts such as the 451 Group, an important conduit to all these constituencies, need to be filled in as well.
Moore filled in as a starter and has improved by the game.
Cox has filled in as a guest presenter on Radio 2 but it is her first regular presenting gig on the station.
As the game progresses the mystery of Phelps' inner psychological landscape is filled in, as flashbacks tantalisingly offer up key moments of insight.
Fàbregas has normally been employed in an attacking role over his career, and even filled in as a false No9 for Barça and Spain in recent seasons.
He has filled in as a make-shift centre-back when required.
You'll know if it's primed to listen because the little microphone icon will be filled in, as you can see in the side-by-side example below.
William J. Clinton All the corners of his days were filled in, as they are when someone has found the work that best suits his disposition.
By the following season, he was playing backup halfback to freshman Harmon S. Graves, although he occasionally filled in as a fullback.
During the Terminal Classic, these stairways were filled in, as were many of the access doorways to the acropolis itself, with some buildings being sealed completely.
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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