How to pass labels via mobile redirect in htaccess?

Question

Apache HTTP Server

There is site1.ru/?idsite={sid}&company={cid} with macros in the link from the ad network.
You need to redirect to site2.ru with site1.ru tags like site2.ru/abc/{sid}/{cid}/ via htaccess.
So far there is:
RewriteEngine on
RewriteCond %{HTTP_USER_AGENT} (?i:iphone|ipad)
RewriteRule ^(/)?$ site2.ru [R=301]

I think that the transmission should be through the QSA flag.
Something like this:
RewriteCond %{QUERY_STRING} ^idsite=([0-9]+)&company=([0-9]+)$
RewriteRule ^(/)?$ site2.ru/abc/$1/$2 [QSA ,L,R=301]

Please help me understand how this can be done? And is it even possible