Streaming a song in lossless format which I have bought earlier as ACC 256kb

I have bought more than 500 songs on iTunes Store before Apple was providing Streaming Music in a lossless format.

My question is, when I decide for Apple Music over Spotify, can I stream the songs that I bought earlier in a lossless format, or am I doomed to hear all my bought music in the low quality ACC 256kb sound quality?

If possible how do I manage to hear all music in lossless?

Thankful for any help.