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Yeah a liner can fit. Actually the frame came with liners in there already but I removed them thinking they were just guides to get the cables from A to B (internal routing). Will search my boxes to see if I kept them.
Hovis-
I just removed liners from someone's bike.
They were running from the DT bosses all the way to the derailleurs.
The shifting action had pulled the liner away from the long-tailed ferrule at the boss and water had gathered at the BB (lowest point).
The cable had rusted and one strand detached, which stuck in the housing and threw the indexing out.
Scilly.Suffolk
If the liner can fit in that tiny house, then you're sorted.
It's a good idea to run it from the plastic cable guide on the BB to the very top of the derailleur clamp, but ensure to leave enough room for it to shift to the largest chainring.
If it doesn't fit however, it's best to just spray GT85 through the hole if possible every once in a while, but it's rare for it to get murky enough to hindrance shifting performance.
Alternatively, I may recommend good mudguard to keep your drivetrain from getting sillily murky.