Translate mxliff with Trados

Hi Team,
I am using Trados to translate Phrase's mxliff files.
However, I found that Trados does not recognize the tags in mxliff and does not support custom tags via regex.
1. Is there any way to add tags during the translation of mxliff files?
2. It seems that Trados can only add tags at the very beginning. Is there any way to convert specific content into tags using regex during the translation process?
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