zf and fdm=marker, "style" customization

With
set fdm=marker

pressing zf on a visual selection containing

line1
line2

gives

line1#{{{
line2#{{{

(or another symbol depending on the current filetype)

What can be done to obtain

line1 #{{{
line2 #{{{

?

(I would prefer not modifying commentstring as it can be used somewhere
else giving a strange result then)

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