OSD overlay chips?

I’ve seen some v expensive composite overlay chips and boards for more than an FC and was wondering what other options there may be?

For a couple of projects I’m thinking of I could do with overlaying video before sent to VTX so in middle like our quad FCs. Think GPS position or time over lay on feed before broadcast (maybe RC car etc)

Controlled by Arduino or esp32 kind of thing

Actually found one on a clearance site (not this site)… £18.