The only British and Commonwealth squadrons flying the Marauder were
14 (8/42-9/44) anti-shipping role
39 (12/44-9/46)
12 SAAF (1/44-11/45)
21 SAAF (7/44-9/45)
24 SAAF (12/43-11/45)
25 SAAF (10/44-7/45)
30 SAAF (8/44-9/45)
Must admit I've never heard of operations as far as Ukraine from the Italian bases that these squadrons used. And most of Ukraine was back in Soviet hands by spring 1944 (remembering that today much of what is western Ukraine was part of Poland in WW2). You should be able to download the Operational Record Books of the British squadrons from The National Archives.. This is the map for Operation Bagration that started in June 1944. Note the jumping off point.
There is a Marauder Assoc that might be able to help but it doesn't seem to have been active for a long time though.
www.39thsquadronmarauders.org.uk