Yes and no. There was a reasonable level of conversions going from one sect of Islam to another in the Qing. However by the end of the 1700s the government had forbidden conversion to Islam by non-Muslims. This was in part the result of the Dungan Revolts which kinda turned the state off on the whole Islam idea, so if there was a lot of conversion and proselytising going on in the period there's not much record of it. However around this time there were efforts to convert muslims from one sect to another.

Generally throughout the history of Islam in China there really wasn't much conversion going on, at least based on the records that we have. Instead the efforts of the more prominent scholars like Liu Zhi and Ma Dexin had more to do with bringing the greater Islamic 'classics' (in the East Asian sense of the term) to China in order to improve Islam domestically, both through translation of the Persian and Arab works and by trying to bring the different philosophies into some sort of balance.

I can't say I've ever come across any reference to or push for active proselytisation of non-Muslims in their writings.

Have a look at Gladney's Islam in China: Accommodation or Separatism? and also Interpretations of Islam in China: a Hui scholar's perspective (co-authored with Ma Shouqian) which you can probably get on Muse or JSTOR. These touch on some of the mid-Qing stuff.

p.s. I used to have [Islam in China] flair from an earlier academic path, just in case you're wondering why the Sinotibetan Linguistics guy is answering this question.