is there a way to make an animated texture for a bedrock block bench entity

[bleak lintel]

?

[worthy light]

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[fleet mesa]

Yes:

right click the texture > Flipbook Animation

This will let you create more frames for your animated texture, based on that one you already had.
After clicking Apply, if you more than one frame, you'll see a little tab that lets you play the texture animation, or manually drag the playhead to whichever frame you want to see in the viewport + the UV or Paint tab.